Venice Models

Three read-only endpoints for model discovery — all GET:

All three take an optional ?type= filter: text, image, video, music, tts, asr, embedding, upscale, inpaint, all, code.

All three are authenticated (Bearer API key or x402 SIWE) like every other /api/v1 route.

Use when

• You need to pick a model at runtime based on capabilities (vision, reasoning, function calling, E2EE, X search, multi-image, …).
• You need to validate a request against a model's constraints (prompt length, aspect ratio, resolution, steps).
• You need the current price per million tokens / per image / per second / per 1k chars to build a cost estimate.
• You want to resolve a user-friendly trait name (e.g. default, default_reasoning, highest_quality) or a frontier-style ID (openai-gpt-54-pro, claude-opus-4-7) to a concrete Venice model ID.

GET /models

curl "https://api.venice.ai/api/v1/models?type=text"

{
  "object": "list",
  "type": "text",
  "data": [
    {
      "id": "zai-org-glm-5-1",
      "created": 1699000000,
      "model_spec": {
        "name": "GLM 5.1",
        "description": "Balanced blend of speed and capability...",
        "availableContextTokens": 200000,
        "maxCompletionTokens": 24000,
        "privacy": "private",
        "beta": false,
        "betaModel": false,
        "modelSource": "https://huggingface.co/zai-org/GLM-5.1",
        "offline": false,
        "capabilities": { ... },
        "constraints": { ... },
        "pricing": { ... },
        "regionRestrictions": ["US"],
        "deprecation": {"date": "2025-03-01T00:00:00.000Z"}
      }
    }
  ]
}

model_spec.capabilities — text models

model_spec.constraints — by model family

• Text — temperature.default, top_p.default, and {frequency,presence,repetition}_penalty.default.
• Image — promptCharacterLimit, widthHeightDivisor, steps.{default,max}, optional aspectRatios[] + defaultAspectRatio, optional resolutions[] + defaultResolution (the last two appear only on models that use ratio/resolution-based sizing).
• Video — aspect_ratios[], resolutions[], durations[], model_type (text-to-video/image-to-video/video), audio, audio_configurable, prompt_character_limit.
• Inpaint / edit — aspectRatios[], promptCharacterLimit, combineImages.
• TTS / Music (fields surface at the top level of model_spec, not inside constraints) — voices[], default_voice, supports_lyrics, lyrics_required, supports_lyrics_optimizer, supports_force_instrumental, supports_speed, supports_language_code, min_speed, max_speed, min_prompt_length, prompt_character_limit. Internal TTS per-model toggles like supportsPromptParam / supportsTemperatureParam / supportsTopPParam exist on the model definitions but are not merged into /models output today — treat the speech request schema as the support matrix.
• Embedding (top-level, not inside constraints) — embeddingDimensions, maxInputTokens, supportsCustomDimensions.

model_spec.pricing — by model family

• LLM — input.{usd,diem}, output.{usd,diem} per 1 000 000 tokens, plus optional cache_input (reads), cache_write (writes, e.g. Anthropic 1.25×), and extended.* tier triggered by context_token_threshold.
• Image — either generation.{usd,diem} per image (flat) or resolutions.<tier>.{usd,diem} (per 1K/2K/4K). Every image row also carries a global upscale.{2x,4x}.{usd,diem} block (derived from shared upscale SKUs) — treat it as account-wide upscale pricing, not a signal that this specific model can upscale. Combine with the inpaint/upscale model's own capability check to decide what's actually callable.
• Inpaint / edit — inpaint.{usd,diem} per edit.
• Video — not currently returned on /models. calculatePricing() has no video branch, so video entries have no model_spec.pricing. Use POST /video/quote for the authoritative per-request price.
• Music / long audio — generation.{usd,diem} (per job), per_second.{usd,diem} (per second generated), per_thousand_characters.{usd,diem} (character-priced narration), or durations.<tier>.{usd,diem,min_seconds,max_seconds} (duration-bucketed).
• TTS — input.{usd,diem} per 1 000 000 input characters.
• ASR — per_audio_second.{usd,diem}.
• Embeddings — input.{usd,diem} per 1 000 000 tokens.

Crypto RPC pricing is not in /models — it's tier × chain multipliers on /crypto/rpc/{network} (see venice-crypto-rpc).

Other top-level model_spec fields

GET /models/traits

curl "https://api.venice.ai/api/v1/models/traits?type=text"

Returns { object: "list", type: "text", data: { "default": "zai-org-glm-5-1", "fastest": "grok-41-fast", "most_uncensored": "venice-uncensored", "default_reasoning": "...", "default_code": "...", "default_vision": "...", "function_calling_default": "...", "most_intelligent": "..." } } for type=text. For type=image, expect keys like default, fastest, highest_quality, eliza-default. Trait keys come from the internal ApiModelTraits / LLMApiModelTraits / ImageApiModelTraits enums.

Use this to avoid hard-coding model IDs — resolve a trait at boot and cache for the session.

GET /models/compatibility_mapping

curl "https://api.venice.ai/api/v1/models/compatibility_mapping?type=text"

Returns { object: "list", type: "text", data: { "openai-gpt-54-pro": "zai-org-glm-5-1", "claude-opus-4-7": "claude-opus-4-7", "gpt-5-4-pro": "openai-gpt-54-pro", ... } }. Both OpenAI-style IDs (openai-gpt-54-pro) and vendor-style aliases (gpt-5-4-pro) may appear as keys.

Lets an OpenAI-style client call Venice with its native model IDs — Venice substitutes behind the scenes. Useful when porting existing code.

Common patterns

Pick a vision+reasoning model at runtime

const list = await fetch(`${base}/models?type=text`).then(r => r.json())
const match = list.data.find((m: any) =>
  m.model_spec.capabilities.supportsVision &&
  m.model_spec.capabilities.supportsReasoning &&
  !m.model_spec.offline &&
  !m.model_spec.beta
)

Validate an image request before submit

const spec = (await fetch(`${base}/models?type=image`).then(r => r.json()))
  .data.find((m: any) => m.id === myModel)!.model_spec

const { widthHeightDivisor, promptCharacterLimit, aspectRatios } = spec.constraints
if (prompt.length > promptCharacterLimit) throw new Error('prompt too long')
if (width % widthHeightDivisor !== 0) throw new Error('width not divisible')
if (aspectRatios && !aspectRatios.includes(myAspect)) throw new Error('bad aspect')

Estimate LLM cost

const p = spec.pricing
const cost =
  (inputTokens / 1_000_000) * p.input.usd +
  (outputTokens / 1_000_000) * p.output.usd +
  (cachedTokens / 1_000_000) * (p.cache_input?.usd ?? 0)

For extended-context runs, check if inputTokens > p.extended?.context_token_threshold and switch to p.extended.* rates.

?type=code

type=code is a convenience filter returning text models with capabilities.optimizedForCode === true. Same response shape as type=text.

Gotchas

• The catalog changes — cache for minutes, not days.
• beta: true models require beta-flagged keys — otherwise 401 with "only available to Pro users".
• offline: true means the model exists in the catalog but can't currently serve requests — treat it as absent for scheduling.
• model_spec.pricing can be missing on free / internal models — guard against undefined.
• traits differ by type — there's no "global default"; always pass ?type=....
• compatibility_mapping resolves model IDs, not capabilities. If your caller sends openai-gpt-54-pro but needs vision, verify via the resolved Venice model's capabilities.supportsVision.