Data points: 111
Model compare
The readout for GPT-5.1 Codex Max and GPT-5.4, before the detailed comparison sheet.
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 15.4 to 84.6.
Evidence depth
111 data points
Includes 21 benchmark rows, 1 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 30 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-5.1 Codex Max and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 Codex Max | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 15.4 pts | 84.6 pts |
| Benchmark category leads | 1 categories | 6 categories |
| Operational advantages | Average speed | Cheapest input price, First-token latency, Free providers, Provider coverage |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImage Output Text | Input Text |
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-5.1 Codex Max | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Dec 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1-codex-max | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 Codex Max and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1 Codex Max
GPT-5.1 Codex Max is stronger in benchmark categories (Multimodal) and operational dimensions (Average speed).
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Multilingual) and operational dimensions (Cheapest input price, First-token latency, Free providers, Provider coverage).
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-5.1 Codex Max
55.5
Avg. score
GPT-5.4
58.4
GPT-5.4 leads by 6.1
GPT-5.4 leads by 11.1
GPT-5.4 leads by 3.4
GPT-5.4 leads by 4.9
GPT-5.4
GPT-5.4 leads by 3.5
GPT-5.1 Codex Max leads by 9.9
GPT-5.4 leads by 1.5
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1 Codex Max
71.0
Rank #29/127 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner86.0
Rank #3/127 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
83.0
Rank #5/70 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner87.5
Rank #3/70 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
67.3
Rank #30/89 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner74.0
Rank #5/89 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
5.7
Rank #30/73 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner23.4
Rank #7/73 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
77.6
Rank #17/100 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner91.2
Rank #1/100 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
40.2
Rank #56/96 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner56.6
Rank #3/96 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
22.2
Rank #20/33 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner67.4
Rank #3/33 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
34.8
Rank #40/85 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner57.6
Rank #5/85 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
73.6
Rank #26/92 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner96.8
Rank #1/92 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
23.4
Rank #45/96 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner41.6
Rank #7/96 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
34.7
Rank #46/99 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner51.4
Rank #9/99 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
86.0
Rank #40/96 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner92.0
Rank #10/96 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
39.2
Rank #23/90 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner50.0
Rank #10/90 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
74.4
Rank #48/90 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner88.6
Rank #19/90 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
84.0
Rank #8/62 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner100.0
Rank #1/62 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
winner86.5
Rank #6/81 · confidence 1 · eval date 2025-11-19
GPT-5.4
60.0
Rank #49/81 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
72.5
Rank #36/57 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner78.4
Rank #15/57 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
82.0
Rank #15/75 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner92.6
Rank #2/75 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
70.0
Rank #39/86 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner73.9
Rank #24/86 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
74.6
Rank #24/95 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner87.5
Rank #8/95 · confidence 4 · eval date 2026-03-05
GPT-5.1 Codex Max
83.0
Rank #50/84 · confidence 1 · eval date 2025-11-19
GPT-5.4
winner87.1
Rank #37/84 · confidence 4 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 Codex Max | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | GPT-5.1 Codex Max gpt-5.1-codex-max No audit yet | GPT-5.4 gpt-5.4 Audit score 93 1008486100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.1 Codex Max | GPT-5.4 |
|---|---|---|
100 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
50 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
23 tests | GPT-5.1 Codex Max speed / latency 72 tok/s / 7976ms input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
20 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 4032ms input / output No data |
20 tests | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
GPT-5.1 Codex Max gpt-5.1-codex-max-2025-12-04 speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0/request | |
GPT-5.1 Codex Max gpt-5.1-codex-max speed / latency No data input / output $0.0062/request | GPT-5.4 gpt-5.4 speed / latency No data input / output $2.57/M | |
GPT-5.1 Codex Max gpt-5.1-codex-max speed / latency No data input / output $0.010/request | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $4.11/M |
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
