gpt-oss-120b
- Family
- GPT-OSS
- Released
- 2025-08-05
- Context
- 128K
- Parameters
- 120B
- Architecture
- Decoder Only
- Knowledge cutoff
- 2025-08
- Specialization
- general
- Openness
- Open source
- License
- Apache 2.0OSI-approvedPermitted
- Weights
- Unknown
- Code
- Unknown
- Training
- Pretrained
Cheapest of 13 routes · Open Inference
About
OpenAI open-weight model with 120 billion parameters. Text-only model supporting reasoning, function calling, and structured outputs. Free for self-hosting. Released August 5, 2025.
Providers(13)
Compare all 13Compare API pricing across 13 tracked provider routes for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Cache | Route |
|---|---|---|---|---|
| Open Inference | Free | Free | - | Serverless |
| OpenRouter | $0.037 | $0.170 | - | Serverless |
| Novita AI | $0.050 | $0.250 | - | Serverless |
| GCP Vertex AI | $0.090 | $0.360 | - | Serverless |
| Featherless | $0.150 | $0.600 | - | Serverless |
| Fireworks AI | $0.150 | $0.600 | - | Serverless |
| GroqCloud | $0.150 | $0.600 | - | Serverless |
| Together AI | $0.150 | $0.600 | - | Serverless |
| Replicate API | $0.180 | $0.720 | - | Serverless |
| Cloudflare Workers AI | $0.350 | $0.750 | - | Serverless |
| Vercel AI Gateway | $0.350 | $0.750 | read $0.250 | Serverless |
| OpenAI API | - | - | - | ServerlessPartial |
| NVIDIA NIM | - | - | - | ServerlessPartial |
Deprecated provider routes(1)
| Provider | Status | Catalog ID |
|---|---|---|
| Yandex AI Studio | DeprecatedRetired October 30, 2026 | gpt-oss-120b |
Available via routers & gateways(15)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 500+ models from 80+ providers via a single OpenAI-compatible API, with an optional Auto Router that selects a model per prompt from market spend data.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, caching, and guardrails; MIT-licensed open-source core is self-hostable. Now part of Palo Alto Networks as Prisma AIRS AI Gateway.
AIRouter
RouterCommercial LLM router (branded "AI Router" on its site) that picks the best model per request via a Decision API or an OpenAI-compatible Chat Completions endpoint, with a private selection mode that routes on anonymized patterns; sold as BYOK subscription plans priced by routed tokens.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache-2.0 open-source platform with a managed hosted tier for logging and analytics.
Kong AI Gateway
GatewayMulti-LLM AI gateway built on Kong Gateway 3.x, adding semantic routing, load balancing, guardrails, and MCP traffic analytics as plugins over Kong's existing API management platform.
Capabilities
Benchmark peer barsfor RAG
No task-mapped benchmark peers are available for this model yet.
Benchmark scores(3)
| Benchmark | Score | Version | Evaluation | Source |
|---|---|---|---|---|
| 1352.0 | text_style_control overall 2026-10-22 (style control, default view)Observed 2026-10-26 | Configuration: gpt-oss-120b Harness: LMArena blind pairwise human votes, Bradley-Terry Evaluator: LMArena Confidence: confirmed Notes: LMArena text style control leaderboard, overall category, published 2026-10-22 (HF lmarena-ai/leaderboard-dataset @9761a3ce, latest split). Board entry 'gpt-oss-120b': rank 218, Arena Score 1351.8 (95% CI 1347.4-1356.2), 30207 votes. Retrieved 2026-10-26. | Source Source: LMArena (lmarena.ai), CC BY 4.0 | |
| 1274.0 | text creative_writing 2026-10-22Observed 2026-10-22 | Configuration: gpt-oss-120b Harness: LMArena blind pairwise human votes, Bradley-Terry Evaluator: LMArena Confidence: confirmed Notes: LMArena Text arena, Creative Writing category (no style control), board published 2026-10-22 (HF lmarena-ai/leaderboard-dataset @a467e6b9, text config, latest split). Board entry 'gpt-oss-120b' (category creative_writing in text/latest-00000-of-00001.parquet): rank 243 of 416, rating 1274.4 (95% CI 1264.7-1284.1), 3907 votes. Source: LMArena (CC BY 4.0). Retrieved 2026-10-27. | Source Source: LMArena (lmarena.ai), CC BY 4.0 | |
| 32.1 | WMT26 General MT findings, Figure 3 Avg. Rank (lower is better)Observed 2026-10-27 | Configuration: GPT OSS 120B Harness: Contrastive Error Span Annotation (cESA), human annotators Evaluator: WMT26 organizers Confidence: confirmed Notes: WMT26 General MT findings (2026.wmt-1.48), Figure 3: Avg. Rank 32.1 for the system listed as 'GPT OSS 120B', averaged over the 23 language pairs it entered; rank 1 is best, so lower is better (not a 0-100 score). Per-pair cESA scores (0-100, higher is better, not comparable across pairs): cs-vi 66.3, cs-de 62.9, en-cs 52.1, en-de 58.5, en-is 46.6, en-zh-Hant 58.1, en-arz 77.6, en-ru 56.6, en-be 30.5, en-lld 5.5, en-se 2.3, en-et 47.2, en-ja 78.2, en-kk 48.7, en-id 68.3, zh-ja 64.9, en-ko 54.6, en-th 45.5, en-lij 4.4, cs-uk 63.1, en-uk 58.1, en-hy 32.1, en-zh-Hans 61.9. Source: WMT26 organizers. Retrieved 2026-10-27. | Source Source: Findings of the WMT26 General Machine Translation Shared Task (Kocmi et al., 2026) |
Migration checks
No linked migration route is available for this model yet.
Rankings & picks(1)
Compare gpt-oss-120b with other models
Comparison and alternatives
Browse all comparisons →Cheapest of 13 routes · Open Inference