Data points: 65
Model compare
The readout for GPT-4 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 8 to 92.
Evidence depth
65 data points
Includes 0 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1 Codex Max
The charts below split 6 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-4 and GPT-5.1 Codex Max: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4 | GPT-5.1 Codex Max |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 1 categories |
| Operational advantages | First-token latency, Free providers | Cheapest input price, Average speed, Provider coverage |
| Context window | 8.2K tokens | 400K tokens |
| Max output | 4.1K tokens | 128K tokens |
| Modalities | Input Text 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-4 | GPT-5.1 Codex Max |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | May 2023 | Dec 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2021-09-30 | No data |
| OpenRouter ID | openai/gpt-4 | openai/gpt-5.1-codex-max |
| References | No data | No data |
This report only uses LMSpeed data for GPT-4 and GPT-5.1 Codex Max: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4
GPT-4 has these operational advantages: First-token latency, Free providers.
GPT-5.1 Codex Max
GPT-5.1 Codex Max is stronger in benchmark categories (Coding) and operational dimensions (Cheapest input price, Average speed, 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-4
49.5
Avg. score
GPT-5.1 Codex Max
55.5
GPT-5.1 Codex Max
GPT-5.1 Codex Max leads by 2.3
GPT-5.1 Codex Max
GPT-5.1 Codex Max
No data
GPT-5.1 Codex Max
GPT-5.1 Codex Max
GPT-5.1 Codex Max
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
No shared professional benchmark scores are available yet.
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-4 | 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-4 | GPT-5.1 Codex Max |
|---|---|---|
0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 speed / latency N/A / N/A input / output No data | GPT-5.1 Codex Max speed / latency N/A / N/A input / output No data |
GPT-4 gpt-4-32k-0314 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 inputText outputTool callingStructured outputsJSON mode | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
