OpenAI: gpt-oss-20b

reasoning
openai/gpt-oss-20b

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license.

Intelligence
Reasoning
Speed
Context
131K
Max output
131K
Input price
$0.03/1M tokens
Output price
$0.11/1M tokens
Capabilities
vision
tool call
structured output
reasoning
json mode
streaming
fine tuning
batch
Details
Provider OpenRouter
Creator OpenAI
Familygpt-oss
Statusactive
Input modalitiestext
Output modalitiestext
Knowledge cutoff2024-05
Release date—
Deprecation date—
Typereasoning
Reasoning tokensYes
Max input—
Sourceofficial
Last updated2026-03-21
Pricing
Input
$0.03
Output
$0.11
Cache write
—
Cache read
$0.015
Batch in
—
Batch out
—
gpt-oss family
ModelContextMax outInputOutput
OpenAI: gpt-oss-120b (free)RT
131K131K——
OpenAI: gpt-oss-20b (free)RT
131K131K——
OpenAI: gpt-oss-20bRT
131K131K$0.03$0.11
OpenAI: gpt-oss-120bRT
131K—$0.039$0.19
OpenAI: gpt-oss-safeguard-20bRT
131K66K$0.075$0.3
API
GET/v1/models/openrouter/openai/gpt-oss-20b