gpt-oss-20b by fireworksai - AI Model Details, Pricing, and Performance Metrics

openai
gpt-oss-20b
openai

gpt-oss-20b

completions
byfireworksai

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for lower-latency inference and deployability on consumer or single-GPU hardware. The model is trained in OpenAI’s Harmony response format and supports reasoning level configuration, fine-tuning, and agentic capabilities including function calling, tool use, and structured outputs.

Released
Aug 5, 2025
Knowledge
Feb 6, 2025
License
Apache-2.0
Context
131072
Input
$0.07 / 1M tokens
Output
$0.3 / 1M tokens
Capabilities: tools
Accepts: text
Returns: text

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Category Scores

Benchmark Tests

View Other Benchmarks
AA Coding Index
53.7
Programming
AAII
44.8
General
GPQA
71.5
STEM (Physics, Chemistry, Biology)
HLE
8.5
General Knowledge
LiveCodeBench
72.1
Programming
MMLU-Pro
73.6
General Knowledge
SciCode
35.4
Scientific

Code Examples

Integration samples and API usage