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Endpoints

Opper

A hosted service with its own key and prices. This page lists the addresses it answers, the facts its documentation states, and the setup of each harness.

Addresses and facts

  • OpenAI Chat Completions: https://api.opper.ai/v3/compat models.dev, read
Authentication
Authorization: Bearer, with the key in OPPER_API_KEY models.dev, read
Structured output
Unknown
Tool calling
54 of 57 listed models The share of this provider's models that models.dev records with tool calling. models.dev, read
Rate limits
Unknown
Prices
Unknown
Data retention
Unknown
Documentation
Read the page models.dev, read
Output limits Baltor recorded
Unknown

Harness setup

Replace claude-fable-5 with the model you want.

OpenCode

Put this in opencode.json in your project folder:

{
  "$schema": "https://opencode.ai/config.json",
  "provider": {
    "opper": {
      "npm": "@ai-sdk/openai-compatible",
      "name": "Opper",
      "options": {
        "baseURL": "https://api.opper.ai/v3/compat",
        "apiKey": "{env:OPPER_API_KEY}"
      },
      "models": {
        "claude-fable-5": {
          "name": "claude-fable-5"
        }
      }
    }
  }
}
  • OpenCode reads any OpenAI-compatible address through the @ai-sdk/openai-compatible package, and an address that speaks the Responses API through @ai-sdk/openai.

From OpenCode documentation, read .

Pi

Put this in ~/.pi/agent/models.json:

{
  "providers": {
    "opper": {
      "baseUrl": "https://api.opper.ai/v3/compat",
      "api": "openai-completions",
      "apiKey": "$OPPER_API_KEY",
      "models": [
        {
          "id": "claude-fable-5"
        }
      ]
    }
  }
}
  • The apiKey field can name an environment variable as $NAME.

From Pi documentation, read .

Codex

Codex speaks only the Responses API, and Opper documents no Responses address. A gateway that offers one can sit in between.

  • Codex speaks the Responses API only: responses is the one supported wire API of a custom provider. Ollama and LM Studio are built in and start with --oss.

From Codex documentation, read .

Claude Code

Claude Code sends Anthropic Messages requests, and Opper documents no such address. A gateway that translates to that API can sit in between.

  • Claude Code sends Anthropic Messages requests to ANTHROPIC_BASE_URL. Anthropic says it does not support routing Claude Code to models other than Claude through any gateway, so some features may not work with another model.

From Claude Code documentation, read .

Models it lists

Prices in US dollars per million tokens, input and output, as models.dev, read records them.

ModelInputOutputContextAs of
Claude Fable 5 claude-fable-510.00 USD50.00 USD1,000,000 older than 30 days
Claude Fable 5.1 claude-fable-5-110.00 USD50.00 USD1,000,000
Claude Haiku 4.5 (latest) claude-haiku-4-51.10 USD5.50 USD200,000 older than 30 days
Claude Opus 4.5 (latest) claude-opus-4-55.00 USD25.00 USD200,000 older than 30 days
Claude Opus 4.6 claude-opus-4-65.00 USD25.00 USD1,000,000 older than 30 days
Claude Opus 4.7 claude-opus-4-75.50 USD27.50 USD1,000,000 older than 30 days
Claude Opus 4.8 claude-opus-4-85.00 USD25.00 USD1,000,000 older than 30 days
Claude Opus 5 claude-opus-55.50 USD27.50 USD1,000,000 older than 30 days
Claude Sonnet 4.5 (latest) claude-sonnet-4-53.30 USD16.50 USD200,000 older than 30 days
Claude Sonnet 4.6 claude-sonnet-4-63.30 USD16.50 USD1,000,000 older than 30 days
Claude Sonnet 5 claude-sonnet-52.20 USD11.00 USD1,000,000 older than 30 days
DeepSeek V4 Flash deepseek-v4-flash0.250 USD0.660 USD1,000,000 older than 30 days
DeepSeek V4 Pro deepseek-v4-pro1.79 USD3.58 USD1,000,000 older than 30 days
Devstral 2 devstral-25120.400 USD2.00 USD256,000 older than 30 days
Gemini 3 Flash Preview gemini-3-flash-preview0.500 USD3.00 USD1,048,576 older than 30 days
Gemini 3.1 Pro Preview gemini-3.1-pro-preview2.00 USD12.00 USD1,048,576 older than 30 days
Gemini 3.5 Flash gemini-3.5-flash1.50 USD9.00 USD1,048,576 older than 30 days
Gemini 3.5 Flash Lite gemini-3.5-flash-lite0.300 USD2.50 USD1,048,576 older than 30 days
Gemini 3.7 Flash gemini-3.7-flash0.750 USD3.75 USD1,048,576 older than 30 days
Gemini 3.8 Flash gemini-3.8-flash0.825 USD4.12 USD1,048,576
Gemma 4 31B IT gemma-4-31b-it0.465 USD2.44 USD256,000 older than 30 days
GLM-5.2 glm-5.21.63 USD5.81 USD1,000,000 older than 30 days
GLM-5.3 glm-5.31.75 USD4.65 USD1,000,000 older than 30 days
GLM-5.3-Flash glm-5.3-flash0.200 USD0.500 USD1,000,000
GPT-5.3 Chat (latest) gpt-5.3-chat-latest1.75 USD14.00 USD128,000 older than 30 days
GPT-5.3 Codex gpt-5.3-codex1.75 USD14.00 USD400,000 older than 30 days
GPT-5.4 gpt-5.42.50 USD15.00 USD1,050,000 older than 30 days
GPT-5.4 mini gpt-5.4-mini0.750 USD4.50 USD400,000 older than 30 days
GPT-5.4 nano gpt-5.4-nano0.200 USD1.25 USD400,000 older than 30 days
GPT-5.4 Pro gpt-5.4-pro30.00 USD180.00 USD1,050,000 older than 30 days
GPT-5.5 gpt-5.55.00 USD30.00 USD1,050,000 older than 30 days
GPT-5.5 Pro gpt-5.5-pro30.00 USD180.00 USD1,050,000 older than 30 days
GPT-5.6 Luna gpt-5.6-luna0.200 USD1.20 USD1,000,000 older than 30 days
GPT-5.6 Sol gpt-5.6-sol5.00 USD30.00 USD1,000,000 older than 30 days
GPT-5.6 Terra gpt-5.6-terra2.00 USD12.00 USD1,000,000 older than 30 days
GPT-6 Astra gpt-6-astra10.00 USD50.00 USD1,050,000
GPT OSS 120B gpt-oss-120b1.16 USD4.88 USD128,000 older than 30 days
GPT OSS 20B gpt-oss-20b0.116 USD0.488 USD128,000 older than 30 days
Grok 4.3 grok-4.31.25 USD2.50 USD1,000,000 older than 30 days
Grok 4.5 grok-4.52.00 USD6.00 USD500,000 older than 30 days
Grok 4.6 grok-4.62.00 USD6.00 USD500,000 older than 30 days
Grok Build 0.1 grok-build-0.11.00 USD2.00 USD256,000 older than 30 days
Kimi K3 kimi-k33.00 USD15.00 USD1,048,576 older than 30 days
MiniMax-M2.7 minimax-m2.70.697 USD2.79 USD196,608 older than 30 days
MiniMax-M3 minimax-m30.600 USD2.40 USD1,000,000 older than 30 days
Mistral Large 3 mistral-large-25120.500 USD1.50 USD256,000 older than 30 days
Mistral Small 4 mistral-small-26030.581 USD2.44 USD256,000 older than 30 days
Muse Spark 1.2 muse-spark-1.21.25 USD4.25 USD1,048,576 older than 30 days
Muse Spark 1.3 muse-spark-1.31.25 USD4.25 USD1,048,576
Qwen3 Coder Next qwen3-coder-next0.581 USD2.32 USD262,144 older than 30 days
Qwen3.6 35B-A3B qwen3.6-35b-a3b0.248 USD1.49 USD262,144 older than 30 days
Qwen3.8 2.4T A95B qwen3.8-2.4t-a95b2.50 USD6.00 USD262,144 older than 30 days
Qwen3.8 27B qwen3.8-27b0.581 USD3.00 USD262,144 older than 30 days
Qwen3.8 Max qwen3.8-max2.00 USD6.00 USD983,616 older than 30 days
Sonar sonar1.00 USD1.00 USD128,000 older than 30 days
Sonar Pro sonar-pro3.00 USD15.00 USD200,000 older than 30 days
Sonar Reasoning Pro sonar-reasoning-pro2.00 USD8.00 USD128,000 older than 30 days

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