Best OpenAI Reasoning Models
The best OpenAI model for reasoning is GPT-5.6 Sol — 58.9 intelligence with extended step-by-step thinking. GPT-5.6 Terra (55.0) and GPT-5.5 (54.8) round out the top three.
Large language models with extended reasoning / thinking, ranked by intelligence. The smartest AI models for complex multi-step reasoning, math and analysis.
- 1
gpt-5.6-solReasoningToolsJSON+158.9 intel · $5.00/M · 1.1M ctx58.9Intelligence - 2gpt-5.6-terraReasoningToolsJSON+155.0 intel · $1.00/M · 1.1M ctx55.0Intelligence
- 3gpt-5.5ReasoningToolsJSON+154.8 intel · $5.00/M · 1.1M ctx54.8Intelligence
- 4gpt-5.5:batchReasoningToolsJSON+154.8 intel · $2.50/M · 1.1M ctx54.8Intelligence
- 5gpt-5.4ReasoningToolsJSON+151.4 intel · $2.50/M · 1.1M ctx51.4Intelligence
- 6gpt-5.4:batchReasoningToolsJSON+151.4 intel · $1.25/M · 1.1M ctx51.4Intelligence
- 7gpt-5.6-lunaReasoningToolsJSON+151.2 intel · $0.100/M · 1.1M ctx51.2Intelligence
- 8gpt-5.3-codexReasoningToolsJSON+144.3 intel · $1.75/M · 400K ctx44.3Intelligence
- 9gpt-5.2ReasoningToolsJSON+142.2 intel · $1.75/M · 400K ctx42.2Intelligence
- 10gpt-5.2:batchReasoningToolsJSON+142.2 intel · $0.875/M · 400K ctx42.2Intelligence
- 11gpt-5.2-codexReasoningToolsJSON+140.1 intel · $1.75/M · 400K ctx40.1Intelligence
- 12gpt-5.4-miniReasoningToolsJSON+140.0 intel · $0.750/M · 400K ctx40.0Intelligence
- 13gpt-5.4-mini:batchReasoningToolsJSON+140.0 intel · $0.375/M · 400K ctx40.0Intelligence
- 14gpt-5.4-nanoReasoningToolsJSON+138.2 intel · $0.200/M · 400K ctx38.2Intelligence
- 15gpt-5.4-nano:batchReasoningToolsJSON+138.2 intel · $0.100/M · 400K ctx38.2Intelligence
- 16gpt-5.1ReasoningToolsJSON+136.9 intel · $1.25/M · 400K ctx36.9Intelligence
- 17gpt-5.1:batchReasoningToolsJSON+136.9 intel · $0.625/M · 400K ctx36.9Intelligence
- 18gpt-5.1-codexReasoningToolsJSON+134.7 intel · $1.25/M · 400K ctx34.7Intelligence
- 19gpt-5ReasoningToolsJSON+134.7 intel · $1.25/M · 400K ctx34.7Intelligence
- 20gpt-5:batchReasoningToolsJSON+134.7 intel · $0.625/M · 400K ctx34.7Intelligence
- 21o3-proReasoningToolsJSON+132.5 intel · $20.00/M · 200K ctx32.5Intelligence
- 22gpt-5.1-codex-miniReasoningToolsJSON+130.6 intel · $0.250/M · 400K ctx30.6Intelligence
- 23o3ReasoningToolsJSON+130.4 intel · $2.00/M · 200K ctx30.4Intelligence
- 24o4-mini-highReasoningToolsJSON+125.6 intel · $1.10/M · 200K ctx25.6Intelligence
- 25o4-miniReasoningToolsJSON+125.6 intel · $1.10/M · 200K ctx25.6Intelligence
Frequently asked
What is the best OpenAI model for reasoning?
The best OpenAI model for reasoning is GPT-5.6 Sol — 58.9 intelligence with extended step-by-step thinking. GPT-5.6 Terra (55.0) and GPT-5.5 (54.8) round out the top three.
What's a good alternative to GPT-5.6 Sol?
GPT-5.6 Terra (55.0) is the closest alternative on this metric, followed by GPT-5.5 (54.8). See the full ranking above for the tradeoffs.
How many OpenAI models are there?
modelgrep tracks 70 OpenAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GPT-5.6 Sol. 25 of them qualify for this ranking.