Model comparison
GPT-5.4 Pro vs GPT-5-Codex
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 37.9 on the Noometry Index. GPT-5-Codex costs 20× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.4 Pro scores higher in 2 categories and GPT-5-Codex in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 Pro leads 70.7 to 30.9.
- GPT-5-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $30 / $180 for GPT-5.4 Pro.
- GPT-5.4 Pro accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5.4 Pro | GPT-5-Codex | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 58.9 | 37.9 |
| Released | 2026-03-05 | 2025-09-15 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $30 | $1.25 |
| Output $ / M tokens | $180 | $10 |
| Results tracked | 16 | 3 |
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Category by category
Coding Too close to call
GPT-5.4 Pro: 43.2 (#90), GPT-5-Codex: 42.4 (#103)
| Benchmark | GPT-5.4 Pro | GPT-5-Codex |
|---|---|---|
| WeirdML | 57.4% | 54.5% |
Agentic & Tool Use Not comparable
GPT-5.4 Pro: —, GPT-5-Codex: 31.0 (#72)
| Benchmark | GPT-5.4 Pro | GPT-5-Codex |
|---|---|---|
| Terminal-Bench | — | 44.3% |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 70.7 (#13), GPT-5-Codex: 30.9 (#83)
| Benchmark | GPT-5.4 Pro | GPT-5-Codex |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 70.3% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| Epoch Capabilities Index | 158.93 | — |
Math Not comparable
GPT-5.4 Pro: 72.4 (#22), GPT-5-Codex: —
| Benchmark | GPT-5.4 Pro | GPT-5-Codex |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge Not comparable
GPT-5.4 Pro: 68.3 (#7), GPT-5-Codex: —
| Benchmark | GPT-5.4 Pro | GPT-5-Codex |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
Frequently asked questions
Is GPT-5.4 Pro better than GPT-5-Codex?
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 37.9 on the Noometry Index. GPT-5-Codex costs 20× less per token, which makes it the better buy when GPT-5.4 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.4 Pro or GPT-5-Codex?
GPT-5-Codex is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; GPT-5.4 Pro lists at $30 and $180.
Is GPT-5.4 Pro or GPT-5-Codex better for coding?
They score almost the same on coding (43.2 vs 42.4); test both on your own repository before choosing.
Which has the bigger context window?
GPT-5.4 Pro does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.4 Pro and GPT-5-Codex share?
1 benchmark has published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and GPT-5-Codex has 3.