> For the complete documentation index, see [llms.txt](https://docs.fastrouter.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fastrouter.ai/api-reference/models.md).

# List Models

## List Available Models

> Returns all available AI models along with their pricing, architecture, context length, supported parameters, and (where applicable) per-parameter allowed values. No authentication required.\
> \
> This is the source of truth for what each model accepts — use \`supported\_parameters\` and \`supported\_params\_details\` to programmatically discover the exact fields and accepted values for any model (chat, video, image, embedding, audio, etc.).

```json
{"openapi":"3.1.0","info":{"title":"FastRouter API Reference","version":"1.0.0"},"tags":[{"name":"Models","description":"List and retrieve available AI models with pricing and capability information."}],"servers":[{"url":"https://api.fastrouter.ai","description":"Production API"}],"security":[],"paths":{"/api/v1/models":{"get":{"operationId":"listModels","tags":["Models"],"summary":"List Available Models","description":"Returns all available AI models along with their pricing, architecture, context length, supported parameters, and (where applicable) per-parameter allowed values. No authentication required.\n\nThis is the source of truth for what each model accepts — use `supported_parameters` and `supported_params_details` to programmatically discover the exact fields and accepted values for any model (chat, video, image, embedding, audio, etc.).","parameters":[],"responses":{"200":{"description":"List of all available models","content":{"application/json":{"schema":{"type":"object","properties":{"data":{"type":"array","description":"Array of model objects","items":{"type":"object","properties":{"id":{"type":"string","description":"Model ID in provider/model format"},"name":{"type":"string","description":"Human-readable model name"},"description":{"type":"string","description":"Long-form description of the model"},"created":{"type":"integer","description":"Unix timestamp when the model was added"},"context_length":{"type":"integer","description":"Maximum context window size in tokens"},"architecture":{"type":"object","description":"Model architecture details","properties":{"modality":{"type":"string","description":"Combined modality string"},"input_modalities":{"type":"array","items":{"type":"string"},"description":"List of supported input modalities"},"output_modalities":{"type":"array","items":{"type":"string"},"description":"List of output modalities produced by the model"},"tokenizer":{"type":"string","description":"Tokenizer used by the model"}}},"pricing":{"type":"object","description":"Pricing details. All values are USD strings (per token unless otherwise noted). An empty string means the field is not applicable for this model.","properties":{"prompt":{"type":"string","description":"Cost per prompt token (USD)"},"completion":{"type":"string","description":"Cost per completion token (USD)"},"request":{"type":"string","description":"Cost per request"},"image":{"type":"string","description":"Cost per image"},"web_search":{"type":"string"},"citation":{"type":"string"},"reasoning":{"type":"string"},"duration":{"type":"string"},"internal_reasoning":{"type":"string"},"input_cache_read":{"type":"string"},"input_cache_write":{"type":"string"},"prompt_more_than_128k_input":{"type":"string"},"completion_more_than_128k_input":{"type":"string"},"prompt_more_than_200k_input":{"type":"string"},"completion_more_than_200k_input":{"type":"string"},"prompt_more_than_272k_input":{"type":"string"},"completion_more_than_272k_input":{"type":"string"},"web_search_per_1000_requests_low":{"type":"string"},"web_search_per_1000_requests_medium":{"type":"string"},"web_search_per_1000_requests_high":{"type":"string"},"web_search_per_1000_requests":{"type":"string"},"audio_output_per_minute":{"type":"string"},"audio_input":{"type":"string"},"audio_output":{"type":"string"},"cached_audio_input":{"type":"string"},"batchPrice":{"type":"object","description":"Per-token pricing for batch processing (if offered)"},"flex_service_tier_pricing":{"type":"object","description":"Flex service-tier pricing overrides (if offered)"},"videoCost":{"type":"array","description":"Per-length/resolution video pricing entries for video models. Null for non-video models."},"videoCostWithAudio":{"type":"array","description":"Per-length/resolution video pricing entries with audio for video models. Null when not applicable."},"imageCost":{"type":"array","description":"Per-size image pricing entries for image models. Null for non-image models."},"priceToShow":{"type":"object","description":"Pre-computed display prices used by the dashboard / docs"}}},"top_provider":{"type":"object","description":"Provider-level information for the model","properties":{"context_length":{"type":"integer"},"max_completion_tokens":{"type":"integer"},"is_moderated":{"type":"boolean"}}},"supported_parameters":{"type":"array","items":{"type":"string"},"description":"Names of parameters accepted by this model on its primary endpoint."},"supported_params_details":{"type":"object","description":"Per-parameter input format details (dataType, enum, min, max). Useful for validating requests before calling the endpoint. Only present for models that publish parameter schemas (typical for video / image / specialised models).","additionalProperties":{"type":"object","properties":{"inputFormat":{"type":"object","properties":{"dataType":{"type":"string","description":"Underlying data type (string, number, bool, ...)"},"enum":{"type":"array","description":"Allowed values (when restricted)"},"min":{"type":"number","description":"Minimum allowed value (numeric params)"},"max":{"type":"number","description":"Maximum allowed value (numeric params)"}}}}}},"models_extra_params":{"type":"object","description":"Extra model metadata","properties":{"category":{"type":"array","items":{"type":"string"},"description":"Optional category tags (e.g. Coding, Legal, Health). Can be null when no categories are assigned."}}},"is_active":{"type":"boolean","description":"Whether this model is currently active / available"},"creator":{"type":"string","description":"Original creator of the model"}}}}}}}}},"429":{"$ref":"#/components/responses/RateLimitError"},"500":{"description":"Internal Server Error"}}}}},"components":{"responses":{"RateLimitError":{"description":"Rate Limited - You have exceeded your request limits (TPM/RPM). Slow down or increase your limits.","content":{"application/json":{"schema":{"type":"object","properties":{"error":{"type":"object","properties":{"message":{"type":"string"},"type":{"type":"string"},"code":{"type":"string"},"status":{"type":"integer"}}}}}}}}}}}
```


---

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