Data points: 121
Model compare
The readout for GPT-5.3 Codex and GPT-5.4 Mini, before the detailed comparison sheet.
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex has the higher weighted result; Model A / B score 88 to 12.
Evidence depth
121 data points
Includes 23 benchmark rows, 2 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 32 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-5.3 Codex and GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 88.0 pts | 12.0 pts |
| Benchmark category leads | 5 categories | 0 categories |
| Operational advantages | Free providers, Provider coverage | Cheapest input price, Average speed, First-token latency |
| 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-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Feb 2026 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2025-08-31 |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-5.4-mini |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.3 Codex and GPT-5.4 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.3 Codex
GPT-5.3 Codex is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Instruction following) and operational dimensions (Free providers, Provider coverage).
GPT-5.4 Mini
GPT-5.4 Mini has these operational advantages: Cheapest input price, Average speed, First-token latency.
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-5.3 Codex
56.5
Avg. score
GPT-5.4 Mini
51.9
GPT-5.3 Codex leads by 2.0
GPT-5.3 Codex leads by 1.0
GPT-5.3 Codex leads by 4.1
GPT-5.3 Codex leads by 7.7
GPT-5.4 Mini
No data
GPT-5.4 Mini
GPT-5.3 Codex leads by 0.8
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.3 Codex
winner64.0
Rank #22/84 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
58.0
Rank #36/84 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
$4.81/M
Rank #132/162 · confidence 4
GPT-5.4 Mini
winner$1.69/M
Rank #95/162 · confidence 4
GPT-5.3 Codex
$1.75/M
Rank #120/162 · confidence 4
GPT-5.4 Mini
winner$0.750/M
Rank #95/162 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #133/162 · confidence 4
GPT-5.4 Mini
winner$4.50/M
Rank #102/162 · confidence 4
GPT-5.3 Codex
winner74.0
Rank #6/89 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
69.3
Rank #23/89 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner91.5%
Rank #12/188 · confidence 4
GPT-5.4 Mini
82.3%
Rank #64/188 · confidence 4
GPT-5.3 Codex
winner16.9
Rank #13/73 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
10.0
Rank #21/73 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner39.9%
Rank #13/187 · confidence 4
GPT-5.4 Mini
17.1%
Rank #65/187 · confidence 4
GPT-5.3 Codex
winner61.8
Rank #4/33 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
48.0
Rank #10/33 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner53.2%
Rank #11/185 · confidence 4
GPT-5.4 Mini
44.2%
Rank #38/185 · confidence 4
GPT-5.3 Codex
winner53.2
Rank #15/96 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
49.9
Rank #23/96 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner58.5
Rank #19/65 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
54.3
Rank #30/65 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner51.8
Rank #8/90 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
37.5
Rank #32/90 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner39.9
Rank #12/96 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
26.6
Rank #38/96 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner91.5
Rank #13/96 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
87.5
Rank #34/96 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
86.9
Rank #22/90 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
winner89.8
Rank #13/90 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner44.3
Rank #17/99 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
40.0
Rank #31/99 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner78.5
Rank #15/57 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
73.3
Rank #33/57 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner75.4
Rank #21/86 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
73.3
Rank #26/86 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner77.3
Rank #10/46 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
60.0
Rank #26/46 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
64.7
Rank #15/21 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
winner72.1
Rank #11/21 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner64.3
Rank #23/53 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
55.5
Rank #29/53 · confidence 3 · eval date 2026-03-17
GPT-5.3 Codex
winner86.0
Rank #41/84 · confidence 1 · eval date 2026-02-05
GPT-5.4 Mini
83.3
Rank #49/84 · confidence 3 · eval date 2026-03-17
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
Winner: GPT-5.4 Mini | GPT-5.3 Codex gpt-5.3-codex No audit yet | GPT-5.4 Mini gpt-5.4-mini Audit score 97 10010086100 |
Winner: GPT-5.4 Mini | GPT-5.3 Codex gpt-5.3-codex No audit yet | GPT-5.4 Mini gpt-5.4-mini Audit score 93 1008486100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.3 Codex | GPT-5.4 Mini |
|---|---|---|
40 tests | GPT-5.3 Codex speed / latency 38 tok/s / 4553ms input / output No data | GPT-5.4 Mini speed / latency 223 tok/s / 3411ms input / output No data |
30 tests | GPT-5.3 Codex speed / latency 21 tok/s / 1485ms input / output No data | GPT-5.4 Mini speed / latency 139 tok/s / 2844ms input / output No data |
25 tests | GPT-5.3 Codex speed / latency 56 tok/s / 4621ms input / output No data | GPT-5.4 Mini speed / latency N/A / N/A input / output No data |
19 tests | GPT-5.3 Codex speed / latency 252 tok/s / 2196ms input / output No data | GPT-5.4 Mini speed / latency 145 tok/s / 5776ms input / output No data |
15 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT-5.4 Mini speed / latency 128 tok/s / 4452ms input / output No data |
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0/M/$0/M | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0/M | |
GPT-5.3 Codex gpt-5.3-codex speed / latency No data input / output $0/request | GPT-5.4 Mini gpt-5.4-mini speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.3 Codex. 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 inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
