gpt-oss-120b

Name: OpenAI: gpt-oss-120b
Brand: openai
SKU: openai/gpt-oss-120b
Price: 0.165 USD
Availability: InStock

openai/gpt-oss-120b

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases.

$0.165 in · $0.66 out per 1M tokens131k contextAug 5, 2025

about 0.04¢ a message

A typical message: about 500 tokens you send and 500 it writes.

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Spec sheet

Published facts from the catalog, billed prices and what we measured here. Anything not measured says so.

Price, billed here

Input, per 1M tokens: $0.165provider $0.15
Output, per 1M tokens: $0.66provider $0.60
Cached input, per 1M: $0.0825provider $0.075
Margin: +10%

Context and formats

Context window: 131,072 tokens
Longest answer: 65,536 tokens
Reads: text
Makes: text
First listed: 2025-08-05

Measured here, last 7 days

First token, median: not measured
Answered without error: not measured

Tools and JSON

Tool calling: declaredthe provider's claim, not yet measured here
JSON output: declaredthe provider's claim, not yet measured here

Price and latency history as JSON: GET /api/planet/history?id=openai/gpt-oss-120b.

About

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...

In OpenAI's words.

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Measured here

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Call it

Use one OpenAI compatible endpoint, this model's id and an am_live_ key from the dashboard. You can also try it in chat first with no key.

curl https://useantimatter.com/v1/chat/completions \
  -H "Authorization: Bearer $ANTIMATTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-oss-120b", "messages": [{"role": "user", "content": "Hello"}]}'

Everything else is in the docs.

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<a href="https://useantimatter.com/planet/openai/gpt-oss-120b"><img src="https://useantimatter.com/api/badge/price?id=openai%2Fgpt-oss-120b" alt="gpt-oss-120b price on Antimatter" height="28"></a>

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