gpt-oss-20b
Knows up to June 2024Missing 2,060 events
gpt-oss-20b
Price not published
gpt-oss-120b
Self-hosted reasoning/agents via vLLM, Transformers, Ollama, LM Studio.
Model idgpt-oss-120b
PricePrice not published
Checked29 September 2026
Knows up to June 2024
2,060events after its cutoff
98 historic, 490 major. 866 days of news.
It launched on 5 August 2025, already missing 51 of them. Coverage before 2026 is thin (34 entries for 2024 and 80 for 2025), so this count is a floor.
Five things it has never heard of
Its cutoff, June 2024, is before this chart starts: every mark here is news it has never seen.
How to call it
4 ways to use gpt-oss-120b, with the model id each provider expects.
| Provider | Model id | Endpoint | Docs |
|---|---|---|---|
| Hugging Face | huggingface.co | ||
| OpenAI API (docs) | gpt-oss-120b |
https://api.openai.com/v1/responses |
developers.openai.com |
| Azure OpenAI (Microsoft Foundry) | gpt-oss-120b |
learn.microsoft.com | |
| OpenRouter | openai/gpt-oss-120b |
openrouter.ai |
Pricing
Price not published.
No price source linked. Checked 29 September 2026.
Specs
- Input
- Text
- Output
- Text
- Context window
- 131,072 tokens
- Max output
- 131,072 tokens
- Open weights
- Yes
- Licence
- Apache-2.0
- Training cutoff
- June 2024
- Released
- 5 August 2025
- Status
- Current
- Type
- Reasoning model
What stands out
What its maker marketed at launch, and what people found later, each with its source.
Single-GPU open MoE
117B total / 5.1B active MoE with MXFP4 weights; runs on one 80GB H100/MI300X.
Open reasoning with full CoT
Configurable low/medium/high reasoning with full chain-of-thought access, harmony format.
Four assistants, one scale
gpt-oss-120b is added as a fifth row. Each row runs from what the model knows (graphite) through the months between its cutoff and its launch (hatched) to today (pink).
- GPT-6 Astra 271 at launch, 1,863 today
- Claude Opus 5.5 372 at launch, 1,795 today
- Gemini 4 Hydrogen 1,863 at launch, 1,889 today
- Grok 4.7 387 at launch, 1,829 today
- gpt-oss-120b 51 at launch, 2,060 today
Show as a table
| Model | Cutoff | Released | Missing at launch | Missing today |
|---|---|---|---|---|
| GPT-6 Astra | April 2026 | 3 September 2026 | 271 | 1,863 |
| Claude Opus 5.5 | June 2026 | 22 September 2026 | 372 | 1,795 |
| Gemini 4 Hydrogen | March 2026 | 12 November 2026 | 1,863 | 1,889 |
| Grok 4.7 | May 2026 | 21 September 2026 | 387 | 1,829 |
| gpt-oss-120b | June 2024 | 5 August 2025 | 51 | 2,060 |
Notes
Open weights (Apache 2.0). OpenRouter from ~$0.04/$0.17 per 1M (provider-dependent). No first-party OpenAI pricing listed.
vllm serve openai/gpt-oss-120b
Sources: