gpt-oss-20b
OpenAI · Open weights · Released Aug 5, 2025 · openai/gpt-oss-20b
131K contextToolsReasoningStructured outputPrompt cachingOpen weights
Available from 12 providersUSD / MTOK · VERIFIED 12 HOURS AGO
EST. MONTHLY COSTclick a row for detail · click headers to sort
| PROVIDER | INPUT | OUTPUT | CACHE | CONTEXT | QUANT | TTFT | TPS | SMOKE | UPTIME |
|---|---|---|---|---|---|---|---|---|---|
| CWCoreWeave | $0.03 | $0.13 | $0.03 | 131K | fp4 | 0.32s | 111 tok/s | 4/5 | 99.9% |
 DeepInfra | $0.03 | $0.14 | — | 131K | bf16 | 0.26s | 141 tok/s | 1/5 | 99.9% |
 Parasail | $0.03 | $0.15 | $0.02 | 131K | fp4 | 1.2s | 66 tok/s | 4/5 | 99.9% |
| PHPhala | $0.04 | $0.15 | — | 131K | — | ✕ | ✕ | 1/5 | 99.9% |
 Novita | $0.04 | $0.15 | — | 131K | fp4 | 0.81s | 155 tok/s | 3/5 | 100.0% |
 SiliconFlow | $0.04 | $0.18 | — | 131K | fp8 | 1.9s | 57 tok/s | 4/5 | 98.3% |
 Together | $0.05 | $0.20 | — | 131K | — | ✕ | ✕ | — | 95.0% |
 Amazon Bedrock | $0.07 | $0.15 | — | 131K | — | 0.47s | 664 tok/s | — | 99.9% |
| Amazon Bedrock | $0.07 | $0.15 | — | 131K | — | — | — | — | — |
 Google | $0.07 | $0.25 | — | 131K | — | ✕ | ✕ | — | 83.8% |
 Fireworks | $0.07 | $0.30 | $0.035 | 131K | — | 0.35s | 208 tok/s | — | 99.7% |
 Groq | $0.075 | $0.30 | $0.037 | 131K | — | 0.78s | 552 tok/s | — | 97.2% |
TTFT/TPS: median (P50) over trailing 72h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · ✕ = probed, endpoint returned no measurable stream · SMOKE: of 5 programmatic capability probes passed (JSON schema, instruction following, tool call, long-context, benign compliance; retry-once) · screened via OpenRouter routing · v0.1 · methodology v1.1 · measured 43 hours ago
Pricing variants · USD / MTok in / out
STANDARD
$0.03 / $0.13
per MTok in / out
CACHE READ $0.03
About
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...
Specifications
Context window131,072
Max output131,072
Modalities intext
Modalities outtext
LicenseOpen weights
ReleasedAug 5, 2025
Knowledge cutoff2024-06-30
TokenizerGPT
WeightsHugging Face ↗
Related
Embed badge
[](https://modelindex.ai/models/openai/gpt-oss-20b)Sources
OpenRouter API12 hours ago
AGGREGATORHugging Face12 hours ago
COMMUNITYModelIndex benchmarks43 hours ago
MEASUREDVerified 12 hours ago · list prices, not negotiated rates.