OpenAI: gpt-oss-20b

Coming soonQuick Start

gpt-oss-20b is OpenAI's open-weight 21B parameter model, released 2025-08, built on a Mixture-of-Experts architecture with 3.6B active parameters for low-latency inference on single-GPU hardware. It is licensed under Apache 2.0 and supports reasoning, tool calling, and structured output.

This model is not routed on MirAPI yet — prices shown are the official list prices. Create an account to get notified when it goes live.

Modalities
inTextoutText
Price / 1M
$0.03 / $0.13
Context
131K
Knowledge cutoff
2024-06-30

Capabilities

ReasoningTool usePrompt cachingStructured output

Benchmarks

bar = score (0–100) · ▏ median

Scores from vendor reports and public leaderboards. No private evals.

Intelligence Index
General ability
15.2
#70
Coding Index
Code
20.7
#73
Agentic Index
Agentic
3.1
#68
GPQA Diamond
Science QA
67.0
#73
τ-bench (airline)
Agentic tool use
51.2
#73

Showcase

Three fixed prompts, identical for every chat model. Outputs are archived verbatim — copy the prompt to reproduce.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt; the output lands here verbatim, with tokens and per-run cost.

Quick Start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="openai/gpt-oss-20b",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire gpt-oss-20b into your product

1M free tokens to start · no card · OpenAI-compatible, one base_url change

Start free