Best OpenAI Reasoning Models

Large language models with extended reasoning / thinking, ranked by intelligence. The best models for complex multi-step reasoning, math and analysis.

1. 1O
   gpt-5.4

   ReasoningToolsJSON+156.8 intel · $2.50/M · 40 t/s
   56.8

   Intelligence
2. 2O
   gpt-5.5

   ReasoningToolsJSON+156.7 intel · $5.00/M · 36 t/s
   56.7

   Intelligence
3. 3O
   gpt-5.3-codex

   ReasoningToolsJSON+153.6 intel · $1.75/M · 50 t/s
   53.6

   Intelligence
4. 4O
   gpt-5.2-codex

   ReasoningToolsJSON+149.0 intel · $1.75/M · 49 t/s
   49.0

   Intelligence
5. 5O
   gpt-5.1

   ReasoningToolsJSON+147.7 intel · $1.25/M · 50 t/s
   47.7

   Intelligence
6. 6O
   gpt-5.2

   ReasoningToolsJSON+146.6 intel · $1.75/M · 42 t/s
   46.6

   Intelligence
7. 7O
   gpt-5-codex

   ReasoningToolsJSON+144.6 intel · $1.25/M · 61 t/s
   44.6

   Intelligence
8. 8O
   gpt-5.4-nano

   ReasoningToolsJSON+144.0 intel · $0.200/M · 63 t/s
   44.0

   Intelligence
9. 9O
   gpt-5.1-codex

   ReasoningToolsJSON+143.1 intel · $1.25/M · 39 t/s
   43.1

   Intelligence
10. 10O
    gpt-5

    ReasoningToolsJSON+142.0 intel · $1.25/M · 56 t/s
    42.0

    Intelligence
11. 11O
    gpt-5-mini

    ReasoningToolsJSON+138.9 intel · $0.250/M · 66 t/s
    38.9

    Intelligence
12. 12O
    gpt-5.1-codex-mini

    ReasoningToolsJSON+138.6 intel · $0.250/M · 135 t/s
    38.6

    Intelligence
13. 13O
    o3

    ReasoningToolsJSON+138.4 intel · $2.00/M · 67 t/s
    38.4

    Intelligence
14. 14O
    gpt-oss-120b:free

    ReasoningTools33.3 intel · Free/M · 281 t/s
    33.3

    Intelligence
15. 15O
    gpt-oss-120b

    ReasoningToolsJSON33.3 intel · $0.039/M · 281 t/s
    33.3

    Intelligence
16. 16O
    o4-mini

    ReasoningToolsJSON+133.1 intel · $1.10/M · 67 t/s
    33.1

    Intelligence
17. 17O
    gpt-5-nano

    ReasoningToolsJSON+125.9 intel · $0.050/M · 91 t/s
    25.9

    Intelligence
18. 18O
    o3-mini-high

    ReasoningToolsJSON25.2 intel · $1.10/M · 200K ctx
    25.2

    Intelligence
19. 19O
    gpt-oss-20b:free

    ReasoningTools24.5 intel · Free/M · 131K ctx
    24.5

    Intelligence
20. 20O
    gpt-oss-20b

    ReasoningToolsJSON24.5 intel · $0.029/M · 344 t/s
    24.5

    Intelligence
21. 21O
    gpt-5.4-mini

    ReasoningToolsJSON+123.3 intel · $0.750/M · 72 t/s
    23.3

    Intelligence
22. 22O
    gpt-5.5-pro

    ReasoningToolsJSON+1$30.00/M · 15 t/s · 50.8s ttft
    —

    Intelligence
23. 23O
    gpt-5.4-image-2

    ReasoningJSONVision+1$8.00/M · 34 t/s · 701ms ttft
    —

    Intelligence
24. 24O
    gpt-5.4-pro

    ReasoningToolsJSON+1$30.00/M · 2 t/s · 11.8s ttft
    —

    Intelligence
25. 25O
    gpt-5.2-pro

    ReasoningToolsJSON+1$21.00/M · 16 t/s · 51.3s ttft
    —

    Intelligence