Tanod ML

mlpeek: semantic similarity of text pairs

text_similarity

Read-onlyIdempotent

mlpeek: Score the semantic similarity of one or up to 50 text pairs. Returns the cosine similarity of the embeddings of each text pair (bge-small-en or multilingual-e5-small): one pair as a + b (also a top-level similarity) or 1-50 pairs. Input: a + b, or pairs; each text at most 4,000 characters; optional model. Each text is cut at the model's 512-token window (truncated says so); over 16,384 tokens per request is a 422 (not charged): split it. Runs an open model pinned by hash on Tanod's own CPU (no LLM, no third-party API); an unavailable model is a 503 (not charged). Typically 20-50 ms for one pair, under 1 s for 50 short pairs. Price: USD 0.0005 per pair, at least USD 0.001 per call (1-50 pairs per call: USD 0.001-0.025). Free: 5 mlpeek calls per IP per UTC day. Tanod does not log or store the submitted text; it is processed in memory for this answer.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`a`	No	First text of a single pair (at most 4,000 characters).
`b`	No	Second text of a single pair.
`model`	No	small-en (English) or multilingual.	small-en
`pairs`	No	Alternative to a / b: 1-50 {a, b} pairs. Priced per pair, minimum USD 0.001 per call.

Output Schema

TableJSON Schema

Name	Required	Description
`error`	No	Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object.
`model`	No
`usage`	No
`metric`	No
`results`	No
`similarity`	No
`max_tokens_per_text`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "error": {
+      "description": "Only on an error result: an object {code, message}, or the reason string of an x402 PaymentRequired object."
+    },
+    "max_tokens_per_text": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    },
+    "metric": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "model": {
+      "properties": {
+        "alias": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "id": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "license": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "revision": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "source": {
+          "type": [
+            "string",
+            "null"
+          ]
+        }
+      },
+      "type": [
+        "object",
+        "null"
+      ]
+    },
+    "results": {
+      "items": {
+        "properties": {
+          "index": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "similarity": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "tokens": {
+            "items": {
+              "type": [
+                "integer",
+                "null"
+              ]
+            },
+            "type": [
+              "array",
+              "null"
+            ]
+          },
+          "truncated": {
+            "type": [
+              "boolean",
+              "null"
+            ]
+          }
+        },
+        "type": [
+          "object",
+          "null"
+        ]
+      },
+      "type": [
+        "array",
+        "null"
+      ]
+    },
+    "similarity": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "usage": {
+      "type": [
+        "object",
+        "null"
+      ]
+    }
+  },
+  "type": "object"
+}

First observedOct 8, 2026

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