GPT OSS 20B

ChatInput: TextReleased Aug 5, 2025

Built by OpenAI · United States · openai.com

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...

How to use

model: "openai/gpt-oss-20b"

Cap quality here and save

Hard questions go to this model, easy ones drop to something cheaper. Set a savings target (0–0.8) and the router tunes itself until realized savings converge on it.

{
  "model": "celon/auto",
  "celon": {
    "anchor": "openai/gpt-oss-20b",
    "savings_target": 0.4
  }
}

Naming a model directly gets you that model — savings controls don't apply.

Context

131K

Max output

131K

Input $/1M

$0.03

Output $/1M

$0.14

Features

Tool callingJSON

Serving providers

DeepInfraNovitaW&B Inference

Providers

Price, latency, and uptime per provider serving this model. Celon routes each request to the fastest and cheapest of them. Click a row for regions and data policies.

Loading provider metrics…

Performance

Benchmark quality scores, and measured speed per provider.

Quality

Terminal-BenchAgentic terminal tasks

3.4%

SciCodeScientific code generation

34.4%

At each model's best reasoning effort. Benchmarks it wasn't run on are omitted.

Speed

Loading provider metrics…