Cheapest LLM API

Compare provider offers

offer_compare

Read-onlyIdempotent

Rank current chat offers for up to five canonical model slugs with the website calculator: context-tier prices, cache reads/writes, retries, supported batch rates, capability/benchmark requirements, provider/route preferences, and evidence filters. Input totals include cache shares; cache_hit_percent plus cache_write_percent must be <=100. Average request sizes determine tiers and capacity. Batch is Anthropic direct only. Unknown required evidence excludes offers; missing cache-read rates use standard input rates. Inspect costs, qualification, warnings, assumptions, excludedModels, and pagination.hasMore. Free quotas, non-token fees, and media token accounting are excluded.

Input Schema

Name	Required	Description	Default
`task`	No	Coding requires the code capability; extraction requires structured output. Every offer must support chat.	chat
`limit`	No
`offset`	No
`execution`	No	Batch supports Anthropic direct routes with a published 50% token discount; unsupported routes are excluded.	standard
`route_type`	No		all
`model_slugs`	Yes
`benchmark_id`	No		livebench
`input_tokens`	No
`open_weights`	No
`minimum_score`	No	Zero disables score qualification; a positive threshold excludes missing exact benchmark matches.
`output_tokens`	No
`retry_percent`	No
`provider_slugs`	No
`cache_hit_percent`	No
`require_known_host`	No	Exclude routes without a named underlying inference provider.
`cache_write_percent`	No
`average_input_tokens`	No
`average_output_tokens`	No
`required_capabilities`	No
`minimum_context_tokens`	No
`require_official_prices`	No	Require official paired input/output price verification. Cache rates may have different source provenance.

Output Schema

Name	Required	Description	Default
`data`	Yes
`meta`	Yes
`workload`	Yes
`pagination`	Yes
`assumptions`	Yes
`requirements`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed42 schema fields changedOct 13, 2026

addedInput schema / properties / average_input_tokens

Added value: +{
+  "default": 1500,
+  "maximum": 10000000,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / average_output_tokens

Added value: +{
+  "default": 400,
+  "maximum": 10000000,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / benchmark_id

Added value: +{
+  "default": "livebench",
+  "enum": [
+    "livebench",
+    "aa-intelligence",
+    "aa-coding",
+    "aa-agentic",
+    "swe-bench-verified-epoch-2-0-2",
+    "terminal-bench-2-1-terminus-2",
+    "terminal-bench-2-1-claude-code",
+    "terminal-bench-2-1-codex",
+    "gpqa-diamond",
+    "otis-mock-aime-2024-2025",
+    "livebench-coding",
+    "livebench-agentic-coding",
+    "livebench-reasoning",
+    "livebench-math"
+  ],
+  "type": "string"
+}

addedInput schema / properties / cache_hit_percent

Added value: +{
+  "default": 0,
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / cache_write_percent

Added value: +{
+  "default": 0,
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / execution

Added value: +{
+  "default": "standard",
+  "description": "Batch supports Anthropic direct routes with a published 50% token discount; unsupported routes are excluded.",
+  "enum": [
+    "standard",
+    "batch"
+  ],
+  "type": "string"
+}

addedInput schema / properties / limit

Added value: +{
+  "default": 200,
+  "maximum": 200,
+  "minimum": 1,
+  "type": "integer"
+}

addedInput schema / properties / minimum_context_tokens

Added value: +{
+  "default": 0,
+  "maximum": 10000000,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / minimum_score

Added value: +{
+  "default": 0,
+  "description": "Zero disables score qualification; a positive threshold excludes missing exact benchmark matches.",
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / offset

Added value: +{
+  "default": 0,
+  "maximum": 10000,
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / open_weights

Added value: +{
+  "default": false,
+  "type": "boolean"
+}

addedInput schema / properties / require_known_host

Added value: +{
+  "default": false,
+  "description": "Exclude routes without a named underlying inference provider.",
+  "type": "boolean"
+}

addedInput schema / properties / require_official_prices

Added value: +{
+  "default": false,
+  "description": "Require official paired input/output price verification. Cache rates may have different source provenance.",
+  "type": "boolean"
+}

addedInput schema / properties / required_capabilities

Added value: +{
+  "default": [],
+  "items": {
+    "enum": [
+      "chat",
+      "tool_use",
+      "structured_output",
+      "vision_input",
+      "code",
+      "reasoning"
+    ],
+    "type": "string"
+  },
+  "maxItems": 6,
+  "type": "array"
+}

addedInput schema / properties / retry_percent

Added value: +{
+  "default": 0,
+  "maximum": 1000,
+  "minimum": 0,
+  "type": "number"
+}

addedInput schema / properties / route_type

Added value: +{
+  "default": "all",
+  "enum": [
+    "all",
+    "official",
+    "cloud",
+    "gateway",
+    "unverified"
+  ],
+  "type": "string"
+}

addedInput schema / properties / task

Added value: +{
+  "default": "chat",
+  "description": "Coding requires the code capability; extraction requires structured output. Every offer must support chat.",
+  "enum": [
+    "chat",
+    "coding",
+    "extraction",
+    "custom"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / assumptions

Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / data / properties / excludedModels

Added value: +{
+  "items": {
+    "properties": {
+      "modelSlug": {
+        "type": "string"
+      },
+      "reason": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "modelSlug",
+      "reason"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}

addedOutput schema / properties / data / properties / offers / items / properties / costs

Added value: +{
+  "properties": {
+    "cacheWriteUsd": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "cachedInputUsd": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "outputUsd": {
+      "minimum": 0,
+      "type": "number"
+    },
+    "uncachedInputUsd": {
+      "minimum": 0,
+      "type": "number"
+    }
+  },
+  "required": [
+    "uncachedInputUsd",
+    "cachedInputUsd",
+    "cacheWriteUsd",
+    "outputUsd"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / data / properties / offers / items / properties / offer / properties / evidence

Added value: +{
+  "properties": {
+    "inferenceProvider": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "priceAuthority": {
+      "type": "string"
+    },
+    "providerUrl": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "required": [
+    "inferenceProvider",
+    "providerUrl",
+    "priceAuthority"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / data / properties / offers / items / properties / offer / properties / prices / properties / cacheWritePerMillionTokens
```
Added value: +{
+  "anyOf": [
+    {
+      "minimum": 0,
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ]
+}
```

changedOutput schema / properties / data / properties / offers / items / properties / offer / properties / prices / required

Previous value: -[
-  "inputPerMillionTokens",
-  "outputPerMillionTokens",
-  "cachedInputPerMillionTokens"
-]New value: +[
+  "inputPerMillionTokens",
+  "outputPerMillionTokens",
+  "cachedInputPerMillionTokens",
+  "cacheWritePerMillionTokens"
+]

addedOutput schema / properties / data / properties / offers / items / properties / offer / properties / provenance / properties / checkedAt / anyOf
```
Added value: +[
+  {
+    "format": "date",
+    "type": "string"
+  },
+  {
+    "format": "date-time",
+    "type": "string"
+  }
+]
```
removedOutput schema / properties / data / properties / offers / items / properties / offer / properties / provenance / properties / checkedAt / format
```
Removed value: -"date"
```
removedOutput schema / properties / data / properties / offers / items / properties / offer / properties / provenance / properties / checkedAt / type
```
Removed value: -"string"
```

changedOutput schema / properties / data / properties / offers / items / properties / offer / required

Previous value: -[
-  "id",
-  "model",
-  "provider",
-  "routeType",
-  "prices",
-  "limits",
-  "provenance"
-]New value: +[
+  "id",
+  "model",
+  "provider",
+  "routeType",
+  "prices",
+  "limits",
+  "provenance",
+  "evidence"
+]

addedOutput schema / properties / data / properties / offers / items / properties / qualification

Added value: +{
+  "properties": {
+    "benchmark": {
+      "anyOf": [
+        {
+          "type": "null"
+        },
+        {
+          "properties": {
+            "configuration": {
+              "type": "string"
+            },
+            "id": {
+              "type": "string"
+            },
+            "minimumScore": {
+              "maximum": 100,
+              "minimum": 0,
+              "type": "number"
+            },
+            "score": {
+              "maximum": 100,
+              "minimum": 0,
+              "type": "number"
+            },
+            "sourceUrl": {
+              "format": "uri",
+              "type": "string"
+            },
+            "version": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "id",
+            "minimumScore",
+            "score",
+            "version",
+            "configuration",
+            "sourceUrl"
+          ],
+          "type": "object"
+        }
+      ]
+    },
+    "requiredCapabilities": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "requiredContextTokens": {
+      "minimum": 0,
+      "type": "integer"
+    },
+    "requiredOutputTokens": {
+      "minimum": 0,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "requiredContextTokens",
+    "requiredOutputTokens",
+    "requiredCapabilities",
+    "benchmark"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / data / properties / offers / items / properties / warnings
```
Added value: +{
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}
```

changedOutput schema / properties / data / properties / offers / items / required

Previous value: -[
-  "offer",
-  "workloadCostUsd"
-]New value: +[
+  "offer",
+  "workloadCostUsd",
+  "costs",
+  "qualification",
+  "warnings"
+]

changedOutput schema / properties / data / required

Previous value: -[
-  "offers"
-]New value: +[
+  "offers",
+  "excludedModels"
+]

addedOutput schema / properties / pagination

Added value: +{
+  "properties": {
+    "hasMore": {
+      "type": "boolean"
+    },
+    "limit": {
+      "minimum": 1,
+      "type": "integer"
+    },
+    "offset": {
+      "minimum": 0,
+      "type": "integer"
+    },
+    "page": {
+      "minimum": 1,
+      "type": "integer"
+    },
+    "pageCount": {
+      "minimum": 0,
+      "type": "integer"
+    },
+    "pageSize": {
+      "minimum": 1,
+      "type": "integer"
+    },
+    "total": {
+      "minimum": 0,
+      "type": "integer"
+    }
+  },
+  "type": "object"
+}

addedOutput schema / properties / requirements

Added value: +{
+  "properties": {
+    "benchmarkId": {
+      "type": "string"
+    },
+    "minimumContextTokens": {
+      "minimum": 0,
+      "type": "integer"
+    },
+    "minimumScore": {
+      "maximum": 100,
+      "minimum": 0,
+      "type": "number"
+    },
+    "modelSlugs": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "openWeights": {
+      "type": "boolean"
+    },
+    "providerSlugs": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "requireKnownHost": {
+      "type": "boolean"
+    },
+    "requireOfficialPrices": {
+      "type": "boolean"
+    },
+    "requiredCapabilities": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "routeType": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "modelSlugs",
+    "providerSlugs",
+    "requiredCapabilities",
+    "minimumContextTokens",
+    "openWeights",
+    "routeType",
+    "benchmarkId",
+    "minimumScore",
+    "requireOfficialPrices",
+    "requireKnownHost"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / workload / properties / averageInputTokens
```
Added value: +{
+  "minimum": 0,
+  "type": "integer"
+}
```
addedOutput schema / properties / workload / properties / averageOutputTokens
```
Added value: +{
+  "minimum": 0,
+  "type": "integer"
+}
```

addedOutput schema / properties / workload / properties / cacheHitPercent

Added value: +{
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedOutput schema / properties / workload / properties / cacheWritePercent

Added value: +{
+  "maximum": 100,
+  "minimum": 0,
+  "type": "number"
+}

addedOutput schema / properties / workload / properties / execution

Added value: +{
+  "enum": [
+    "standard",
+    "batch"
+  ],
+  "type": "string"
+}

addedOutput schema / properties / workload / properties / retryPercent

Added value: +{
+  "maximum": 1000,
+  "minimum": 0,
+  "type": "number"
+}

addedOutput schema / properties / workload / properties / task

Added value: +{
+  "enum": [
+    "chat",
+    "coding",
+    "extraction",
+    "custom"
+  ],
+  "type": "string"
+}

changedOutput schema / properties / workload / required

Previous value: -[
-  "inputTokens",
-  "outputTokens"
-]New value: +[
+  "inputTokens",
+  "outputTokens",
+  "averageInputTokens",
+  "averageOutputTokens",
+  "cacheHitPercent",
+  "cacheWritePercent",
+  "retryPercent",
+  "execution",
+  "task"
+]

changedOutput schema / required

Previous value: -[
-  "meta",
-  "workload",
-  "data"
-]New value: +[
+  "meta",
+  "workload",
+  "requirements",
+  "assumptions",
+  "data",
+  "pagination"
+]

Changed3 schema fields changedOct 5, 2026

addedInput schema / $schema

Added value: +"https://json-schema.org/draft/2020-12/schema"

addedInput schema / properties / model_slugs / items / pattern
```
Added value: +"^[a-zA-Z0-9._:-]+$"
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "data": {
+      "properties": {
+        "offers": {
+          "items": {
+            "properties": {
+              "offer": {
+                "properties": {
+                  "id": {
+                    "type": "string"
+                  },
+                  "limits": {
+                    "properties": {
+                      "contextTokens": {
+                        "anyOf": [
+                          {
+                            "minimum": 1,
+                            "type": "integer"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "maxOutputTokens": {
+                        "anyOf": [
+                          {
+                            "minimum": 1,
+                            "type": "integer"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      }
+                    },
+                    "required": [
+                      "contextTokens",
+                      "maxOutputTokens"
+                    ],
+                    "type": "object"
+                  },
+                  "model": {
+                    "properties": {
+                      "name": {
+                        "type": "string"
+                      },
+                      "slug": {
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "slug",
+                      "name"
+                    ],
+                    "type": "object"
+                  },
+                  "prices": {
+                    "properties": {
+                      "cachedInputPerMillionTokens": {
+                        "anyOf": [
+                          {
+                            "minimum": 0,
+                            "type": "number"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
+                      },
+                      "inputPerMillionTokens": {
+                        "minimum": 0,
+                        "type": "number"
+                      },
+                      "outputPerMillionTokens": {
+                        "minimum": 0,
+                        "type": "number"
+                      }
+                    },
+                    "required": [
+                      "inputPerMillionTokens",
+                      "outputPerMillionTokens",
+                      "cachedInputPerMillionTokens"
+                    ],
+                    "type": "object"
+                  },
+                  "provenance": {
+                    "properties": {
+                      "checkedAt": {
+                        "format": "date",
+                        "type": "string"
+                      },
+                      "sourceUrl": {
+                        "format": "uri",
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "sourceUrl",
+                      "checkedAt"
+                    ],
+                    "type": "object"
+                  },
+                  "provider": {
+                    "properties": {
+                      "name": {
+                        "type": "string"
+                      },
+                      "slug": {
+                        "type": "string"
+                      }
+                    },
+                    "required": [
+                      "slug",
+                      "name"
+                    ],
+                    "type": "object"
+                  },
+                  "routeType": {
+                    "enum": [
+                      "official",
+                      "cloud",
+                      "gateway",
+                      "unverified"
+                    ],
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "id",
+                  "model",
+                  "provider",
+                  "routeType",
+                  "prices",
+                  "limits",
+                  "provenance"
+                ],
+                "type": "object"
+              },
+              "workloadCostUsd": {
+                "minimum": 0,
+                "type": "number"
+              }
+            },
+            "required": [
+              "offer",
+              "workloadCostUsd"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "offers"
+      ],
+      "type": "object"
+    },
+    "meta": {
+      "properties": {
+        "apiVersion": {
+          "const": "v1"
+        },
+        "currency": {
+          "const": "USD"
+        },
+        "tokenPriceUnit": {
+          "const": "per_million_tokens"
+        }
+      },
+      "required": [
+        "apiVersion",
+        "currency",
+        "tokenPriceUnit"
+      ],
+      "type": "object"
+    },
+    "workload": {
+      "properties": {
+        "inputTokens": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "outputTokens": {
+          "minimum": 0,
+          "type": "integer"
+        }
+      },
+      "required": [
+        "inputTokens",
+        "outputTokens"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "meta",
+    "workload",
+    "data"
+  ],
+  "type": "object"
+}

First observedOct 4, 2026

TDQS

A3.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnly/idempotent/non-destructive/closed-world. Beyond that, the description adds real behavioral rules: batch is Anthropic-direct only, unknown required evidence excludes offers, missing cache-read rates fall back to standard input rates, and free quotas/non-token fees/media token accounting are excluded. This is substantive context an agent cannot get from annotations alone.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

It is information-dense with essentially no filler, and the purpose and scope are front-loaded. The trade-off is that it reads as one long run-on paragraph with no separation, which slightly hurts scannability for a 21-parameter tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so the description does not need to explain return values, and it appropriately just points at costs, qualification, warnings, excludedModels and pagination.hasMore. Given the high parameter complexity and low schema coverage, a little more per-parameter detail would be ideal, but overall it is close to complete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is only 24% across 21 parameters, so the description must compensate. It does add meaning for cache shares (cache_hit_percent + cache_write_percent <= 100), average request sizing driving tiers, retries, and evidence/capability filters. However, many parameters (limit, offset, input/output token totals, open_weights, minimum_context_tokens, route_type) get no semantic elaboration, leaving a meaningful gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: 'Rank current chat offers for up to five canonical model slugs with the website calculator.' This is clearly a cost/offer ranking tool, distinct-ish from catalog_search and price_watch. It does not explicitly name sibling tools, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use guidance relative to siblings like price_watch, model_detail, or catalog_search. The description explains what inputs do and lists constraints, but never states the conditions under which an agent should choose this tool over the alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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