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modelprices.xyz Single-Model Capability Lookup
x402
modelprices.xyz Single-Model Capability Lookup is a paid API for AI agents from modelprices.xyz, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).
Returns context window size, max output tokens, and capability flags (vision, audio, etc.) for a single LLM model by ID
Price / call$0.003
Success—
StatusUnknown
How this service works
Per-token prices, capability limits, and a price-change feed for 2,000+ LLMs across 70+ providers, normalized into single JSON tables and refreshed hourly.
Output
A JSON object containing the model's ID, context window size in tokens, maximum output tokens, and boolean capability flags such as supports_vision, along with the matched_id confirming which model record was returned.
Example use cases
Check context window before chunking documents
“Before I send this 800-page legal document to an LLM, can you look up the context window size for claude-sonnet-5 so I know how to chunk it?”
Verify vision support before routing image tasks
“I want to send product images to an AI model for captioning — can you check whether gpt-4o supports vision input?”
Compare output token limits for code generation
“I need to generate long code files and want to know the max output tokens for gemini-3-pro — can you look that up?”
Technical details
Endpoint
GEThttps://modelprices.xyz/llm/limit/%7Bmodel%7DWhen to prefer
Use this endpoint when you need structured capability metadata for a specific LLM by ID — especially context window, max output tokens, and modality support flags. Prefer it over manual documentation scraping or general web search when you need machine-readable, normalized, up-to-date specs across providers in a single consistent format.
Side effects
- Model ID not found — returns no match or empty result if the model string does not correspond to a known model
- Misspelled or aliased model names may not resolve to expected records
- Hourly refresh lag means very newly released models may not yet appear
- Malformed model parameter returns an error response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"model": {
"id": "gemini-3-pro",
"context_window": 2000000,
"supports_vision": true,
"max_output_tokens": 65536
},
"matched_id": "gemini-3-pro"
}
}Tags
x402
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