Which models support Reasoning / thinking?
The model can work through a problem step by step before it answers: usually better answers to hard questions, at the cost of more tokens and time.
86 models publish this; 84 don't say.
Supported
75| Model | Company | Value | Since |
|---|---|---|---|
| o1 (2024-12-17)o1-2024-12-17 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| o1 Pro (2025-03-19)o1-pro-2025-03-19 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| o3 mini (2025-01-31)o3-mini-2025-01-31 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| o4 mini (2025-04-16)o4-mini-2025-04-16 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-6 Astragpt-6-astra | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-6.1 Solgpt-6.1-sol | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-6 Lunagpt-6-luna | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-6 Solgpt-6-sol | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.6 Solgpt-5.6-sol | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.6 Terragpt-5.6-terra | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.6 Lunagpt-5.6-luna | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.5gpt-5.5 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.5 Progpt-5.5-pro | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.4gpt-5.4 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.4 minigpt-5.4-mini | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5.4 nanogpt-5.4-nano | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.4 Progpt-5.4-pro | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.2gpt-5.2 | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5.2 Progpt-5.2-pro | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5.1gpt-5.1 | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5gpt-5 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5 Minigpt-5-mini | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5 Nanogpt-5-nano | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| GPT-5 Progpt-5-pro | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| o3 Proo3-pro | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| o3 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.6 Cybergpt-5.6-cyber | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT Realtime 2.1gpt-realtime-2.1 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT Realtime 2.1 minigpt-realtime-2.1-mini | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT Realtime 2gpt-realtime-2 | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| GPT-5.3 Codexgpt-5.3-codex | OpenAI | Supported | in place when tracking began (October 6, 2026) |
| Claude Fable 5.1claude-fable-5-1 | Anthropic | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 5.5claude-opus-5-5 | Anthropic | Supported (thinking: adaptive, always on; default effort: medium) | in place when tracking began (October 6, 2026) |
| Claude Sonnet 5.5claude-sonnet-5-5 | Anthropic | Supported (thinking: adaptive; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Haiku 4.5claude-haiku-4-5-20251001 | Anthropic | Supported (thinking: extended; effort: not supported) | in place when tracking began (October 6, 2026) |
| Claude Mythos 5.1claude-mythos-5-1 | Anthropic | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Fable 5claude-fable-5 | Anthropic | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Mythos 5claude-mythos-5 | Anthropic | Supported (thinking: adaptive, always on; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 5claude-opus-5 | Anthropic | Supported (thinking: adaptive; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 4.8claude-opus-4-8 | Anthropic | Supported (thinking: adaptive; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 4.7claude-opus-4-7 | Anthropic | Supported (thinking: adaptive; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 4.6claude-opus-4-6 | Anthropic | Supported (thinking: adaptive, extended deprecated; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Opus 4.5claude-opus-4-5-20251101 | Anthropic | Supported (thinking: extended; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Sonnet 5claude-sonnet-5 | Anthropic | Supported (thinking: adaptive; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Sonnet 4.6claude-sonnet-4-6 | Anthropic | Supported (thinking: adaptive, extended deprecated; default effort: high) | in place when tracking began (October 6, 2026) |
| Claude Sonnet 4.5claude-sonnet-4-5-20250929 | Anthropic | Supported (thinking: extended; effort: not supported) | in place when tracking began (October 6, 2026) |
| Gemini 3.8 Livegemini-3.8-live | Supported (interleaved reasoning) | in place when tracking began (October 6, 2026) | |
| Gemini 3.8 Live Extended Thinkinggemini-3.8-live-extended-thinking | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.8 Flashgemini-3.8-flash | Supported (minimal is not supported and returns an error) | in place when tracking began (October 6, 2026) | |
| Gemini 3.7 Flashgemini-3.7-flash | Supported (minimal is not supported and returns an error) | in place when tracking began (October 6, 2026) | |
| Gemini 3.6 Flashgemini-3.6-flash | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.5 Flash Litegemini-3.5-flash-lite | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.5 Flashgemini-3.5-flash | Supported | in place when tracking began (October 6, 2026) | |
| Nano Banana 2gemini-3.1-flash-image | Supported | in place when tracking began (October 6, 2026) | |
| Nano Banana Progemini-3-pro-image | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.1 Flash Litegemini-3.1-flash-lite | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.1 Pro Previewgemini-3.1-pro-preview | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3 Flash Previewgemini-3-flash-preview | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Progemini-2.5-pro | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Flashgemini-2.5-flash | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Flash-Litegemini-2.5-flash-lite | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.1 Flash Live Previewgemini-3.1-flash-live-preview | Supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Flash Native Audio Preview (12-2025)gemini-2.5-flash-native-audio-preview-12-2025 | Supported | in place when tracking began (October 6, 2026) | |
| Nano Banana 2 Litegemini-3.1-flash-lite-image | Supported (minimal and high) | in place when tracking began (October 6, 2026) | |
| Mistral Medium 3.5mistral-medium-3-5 | Mistral | Supported | in place when tracking began (October 6, 2026) |
| Mistral Small 4mistral-small-2603 | Mistral | Supported | first seen October 7, 2026 |
| DeepSeek-V4.1-Flashdeepseek-flash | DeepSeek | Supported | in place when tracking began (October 6, 2026) |
| DeepSeek-V4-Pro-0813deepseek-v4-pro | DeepSeek | Supported | in place when tracking began (October 6, 2026) |
| Mistral Large 4mistral-large-4 | Mistral | Supported | first seen October 7, 2026 |
| gpt-oss-120b | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| gpt-oss-20b | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| Daybreak Redgpt-daybreak-red-latest | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| Daybreak Bluegpt-daybreak-blue-latest | OpenAI | Supported | in place when tracking began (October 7, 2026) |
| Gemini Nano Banana 2.1gemini-nano-banana-2.1 | Supported | first seen October 6, 2026 | |
| Claude Haiku 5.5claude-haiku-5-5 | Anthropic | Supported (thinking: adaptive; default effort: medium) | first seen October 8, 2026 |
Not supported
11| Model | Company | Value | Since |
|---|---|---|---|
| Gemini 3.8 Flash TTSgemini-3.8-flash-tts | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.8 Flash Lite TTSgemini-3.8-flash-lite-tts | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.1 Flash TTS Previewgemini-3.1-flash-tts-preview | Not supported | in place when tracking began (October 6, 2026) | |
| Nano Bananagemini-2.5-flash-image | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.5 Live Translate Previewgemini-3.5-live-translate-preview | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 3.5 Transcribegemini-3.5-transcribe | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Flash Preview TTSgemini-2.5-flash-preview-tts | Not supported | in place when tracking began (October 6, 2026) | |
| Gemini 2.5 Pro Preview TTSgemini-2.5-pro-preview-tts | Not supported | in place when tracking began (October 6, 2026) | |
| Lyria 3.5lyria-3.5 | Not supported | in place when tracking began (October 6, 2026) | |
| Lyria 3 Clip Previewlyria-3-clip-preview | Not supported | in place when tracking began (October 6, 2026) | |
| Lyria 3 Pro Previewlyria-3-pro-preview | Not supported | in place when tracking began (October 6, 2026) |
History
- 2026-10-08 claude-haiku-5-5: Reasoning / thinking supported (thinking: adaptive; default effort: medium)
- 2026-10-07 mistral-large-4: Reasoning / thinking supported
- 2026-10-07 mistral-small-2603: Reasoning / thinking supported
- 2026-10-06 gemini-nano-banana-2.1: Reasoning / thinking supported