GPT OSS 20B API

Model details

Context window

131K tokens

Max output

33K tokens

Input

Text

Output

Text

Capabilities

Reasoning, Tool calling, Streaming, JSON output

Interfaces

OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses

Why teams pick it

• GPT OSS 20B for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.

Call GPT OSS 20B

GPT OSS 20B answers on any of the APIs below — pick the one your code already speaks and just swap in your Inferray key.

curl https://api.inferray.com/v1/chat/completions \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-oss-20b",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/messages \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-oss-20b",
  "max_tokens": 1024,
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ]
}'

curl https://api.inferray.com/v1/responses \
  -H "Authorization: Bearer inferray_..." \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-oss-20b",
  "input": "Hello"
}'

Use GPT OSS 20B in your tools

Every coding agent below has a setup guide. Set the model to gpt-oss-20b.

• Claude Code
• Codex
• opencode
• Cline
• Roo Code
• Aider
• Continue

More from OpenAI

Alternatives to GPT OSS 20B

• Claude Haiku 5.5Anthropic's fastest model, priced for volume.Anthropic
• Ministral 14BMinistral 14B for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.Mistral
• Llama 3.3 70B InstructLlama 3.3 70B Instruct for OpenAI-style Chat Completions, Anthropic-style Messages, OpenAI-style Responses.Meta

Questions about this model

How much does the GPT OSS 20B API cost?

GPT OSS 20B costs $0.1 per 1M input tokens and $0.5 per 1M output tokens on Inferray. That is the list price, with no gateway fee on top.

Is there a free tier for GPT OSS 20B?

No. You add credit and pay GPT OSS 20B's list rate for each request — seats, projects, and API keys are free, and pay-as-you-go credit never expires.

Am I charged for failed requests?

No. A request that fails without returning a result is not billed. If a response fails part-way, the tokens already processed before the failure are charged.

Is GPT OSS 20B included in Token Plans?

No. GPT OSS 20B is pay-as-you-go only; Token Plans cover the other text models in the catalog.

Can I use GPT OSS 20B in Claude Code?

Yes. Set ANTHROPIC_BASE_URL to https://api.inferray.com, ANTHROPIC_AUTH_TOKEN to your Inferray key, and ANTHROPIC_MODEL to gpt-oss-20b. The same key works in Codex, opencode, Cline, and other agents.

Does GPT OSS 20B support tool calling and vision?

GPT OSS 20B supports tool calling, reasoning, JSON output and streaming on Inferray. It does not take image input.

Is it the real GPT OSS 20B?

Yes. A request for gpt-oss-20b is answered by GPT OSS 20B from OpenAI, billed at its published list price. Inferray never substitutes a different or smaller model.