Data points: 82
Model compare
The readout for GPT-5.1 Codex Mini 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 8 to 92.
Evidence depth
82 data points
Includes 9 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 17 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 Mini and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 Codex Mini | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 3 categories |
| Operational advantages | Average speed, First-token latency | Cheapest input price, Free providers, Provider coverage |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 100K tokens | 128K tokens |
| Modalities | Input ImageText 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-5.1 Codex Mini | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Nov 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1-codex-mini | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 Codex Mini and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1 Codex Mini
GPT-5.1 Codex Mini has these operational advantages: Average speed, First-token latency.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, 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 Mini
54.8
Avg. score
GPT-5.4
58.4
GPT-5.4
GPT-5.4 leads by 5.6
GPT-5.4 leads by 5.8
GPT-5.4
GPT-5.4 leads by 4.2
GPT-5.4
GPT-5.4
GPT-5.4
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1 Codex Mini
winner209.2 tok/s
Rank #15/139 · confidence 4
GPT-5.4
96.3 tok/s
Rank #60/139 · confidence 4
GPT-5.1 Codex Mini
3.84 s
Rank #59/139 · confidence 4
GPT-5.4
winner0.67 s
Rank #22/139 · confidence 4
GPT-5.1 Codex Mini
3.84 s
Rank #106/139 · confidence 4
GPT-5.4
winner0.67 s
Rank #30/139 · confidence 4
GPT-5.1 Codex Mini
winner$0.250/M
Rank #37/163 · confidence 4
GPT-5.4
$2.50/M
Rank #133/163 · confidence 4
GPT-5.1 Codex Mini
winner$0.688/M
Rank #54/163 · confidence 4
GPT-5.4
$5.63/M
Rank #137/163 · confidence 4
GPT-5.1 Codex Mini
winner$2.00/M
Rank #61/163 · confidence 4
GPT-5.4
$15.00/M
Rank #138/163 · confidence 4
GPT-5.1 Codex Mini
winner16.9%
Rank #65/186 · confidence 4
GPT-5.4
10.6%
Rank #90/186 · confidence 4
GPT-5.1 Codex Mini
winner81.3%
Rank #69/187 · confidence 4
GPT-5.4
74.8%
Rank #96/187 · confidence 4
GPT-5.1 Codex Mini
42.6%
Rank #45/184 · confidence 4
GPT-5.4
winner47.1%
Rank #23/184 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 Codex Mini | GPT-5.4 |
|---|---|---|
| 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-5.1 Codex Mini | GPT-5.4 |
|---|---|---|
100 tests | GPT-5.1 Codex Mini speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 57 tok/s / 3556ms input / output No data |
55 tests | GPT-5.1 Codex Mini speed / latency 82 tok/s / 13938ms input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
20 tests | GPT-5.1 Codex Mini 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 Mini speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
20 tests | GPT-5.1 Codex Mini speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data |
GPT-5.1 Codex Mini gpt-5.1-codex-mini-2025-11-13 speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4 speed / latency No data input / output $0/request | |
GPT-5.1 Codex Mini gpt-5.1-codex-mini speed / latency No data input / output $0.0041/request | GPT-5.4 gpt-5.4 speed / latency No data input / output $2.57/M | |
GPT-5.1 Codex Mini gpt-5.1-codex-mini speed / latency No data input / output $0.0068/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 |
|---|
