Data points: 89
Model compare
The readout for GPT-5 and GPT-5.1 Codex Max, before the detailed comparison sheet.
Weighted outcome: GPT-5.1 Codex Max. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1 Codex Max
GPT-5.1 Codex Max has the higher weighted result; Model A / B score 36 to 64.
Evidence depth
89 data points
Includes 12 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1 Codex Max
The charts below split 18 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for GPT-5 and GPT-5.1 Codex Max: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5 | GPT-5.1 Codex Max |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 36.0 pts | 64.0 pts |
| Benchmark category leads | 1 categories | 4 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImageFile Output Text | Input |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | GPT-5 | GPT-5.1 Codex Max |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Aug 2025 | Dec 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2024-09-30 | No data |
| OpenRouter ID | openai/gpt-5 | openai/gpt-5.1-codex-max |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5 and GPT-5.1 Codex Max: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5
GPT-5 is stronger in benchmark categories (Instruction following) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
GPT-5.1 Codex Max
GPT-5.1 Codex Max leads these benchmark categories: Agents, Coding, Reasoning, Knowledge.
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-5
52
Avg. score
GPT-5.1 Codex Max
52.3
GPT-5.1 Codex Max leads by 4.6
GPT-5.1 Codex Max leads by 1.8
GPT-5.1 Codex Max leads by 4.0
GPT-5.1 Codex Max leads by 1.1
GPT-5
No data
No data
GPT-5 leads by 0.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5
winner75.6
Rank #2/89 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
67.3
Rank #30/89 · confidence 1 · eval date 2025-11-19
GPT-5
5.7
Rank #30/73 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
5.7
Rank #30/73 · confidence 1 · eval date 2025-11-19
GPT-5
20.1
Rank #22/33 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
winner22.2
Rank #20/33 · confidence 1 · eval date 2025-11-19
GPT-5
winner42.9
Rank #46/96 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
40.2
Rank #56/96 · confidence 1 · eval date 2025-11-19
GPT-5
winner40.7
Rank #20/90 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
39.2
Rank #23/90 · confidence 1 · eval date 2025-11-19
GPT-5
winner82.1
Rank #32/90 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
74.4
Rank #48/90 · confidence 1 · eval date 2025-11-19
GPT-5
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
23.4
Rank #45/96 · confidence 1 · eval date 2025-11-19
GPT-5
85.4
Rank #45/96 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
winner86.0
Rank #40/96 · confidence 1 · eval date 2025-11-19
GPT-5
34.7
Rank #48/99 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
winner34.7
Rank #46/99 · confidence 1 · eval date 2025-11-19
GPT-5
winner74.2
Rank #32/57 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
72.5
Rank #36/57 · confidence 1 · eval date 2025-11-19
GPT-5
winner73.1
Rank #29/86 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
70.0
Rank #39/86 · confidence 1 · eval date 2025-11-19
GPT-5
winner84.8
Rank #44/84 · confidence 1 · eval date 2025-08-07
GPT-5.1 Codex Max
83.0
Rank #50/84 · confidence 1 · eval date 2025-11-19
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5 | GPT-5.1 Codex Max |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5 | GPT-5.1 Codex Max |
|---|---|---|
20 tests | GPT-5 speed / latency 95 tok/s / 1234ms input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
8 tests | GPT-5 speed / latency 38 tok/s / 15844ms input / output No data | GPT-5.1 Codex Max speed / latency 72 tok/s / 7976ms input / output No data |
5 tests | GPT-5 speed / latency 45 tok/s / 3704ms input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
5 tests | GPT-5 speed / latency 46 tok/s / 6577ms input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
5 tests | GPT-5 speed / latency 102 tok/s / 948ms input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
GPT-5 gpt-5 speed / latency No data input / output $0/request | GPT-5.1 Codex Max gpt-5.1-codex-max-2025-12-04 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.1 Codex Max. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
