Model comparison
GPT-5.2 Pro vs GPT-5-Codex
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 37.9 on the Noometry Index. GPT-5-Codex costs 17× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5.2 Pro leads 51.5 to 30.9.
- GPT-5-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
Side by side
| GPT-5.2 Pro | GPT-5-Codex | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 52.3 | 37.9 |
| Released | 2025-12-11 | 2025-09-15 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $21 | $1.25 |
| Output $ / M tokens | $168 | $10 |
| Results tracked | 8 | 3 |
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Category by category
Coding Not comparable
GPT-5.2 Pro: —, GPT-5-Codex: 42.4 (#103)
| Benchmark | GPT-5.2 Pro | GPT-5-Codex |
|---|---|---|
| WeirdML | — | 54.5% |
Agentic & Tool Use Not comparable
GPT-5.2 Pro: —, GPT-5-Codex: 31.0 (#72)
| Benchmark | GPT-5.2 Pro | GPT-5-Codex |
|---|---|---|
| Terminal-Bench | — | 44.3% |
Reasoning GPT-5.2 Pro leads
GPT-5.2 Pro: 51.5 (#33), GPT-5-Codex: 30.9 (#83)
| Benchmark | GPT-5.2 Pro | GPT-5-Codex |
|---|---|---|
| ARC-AGI-2 | 54.2% | — |
| SimpleBench | 57.4% | — |
| Kagi LLM Benchmark | — | 70.3% |
| NYT Connections (extended) | 79.3% | — |
| ARC-AGI-1 | 90.5% | — |
| Epoch Capabilities Index | 155.4 | — |
Math Not comparable
GPT-5.2 Pro: 65.3 (#29), GPT-5-Codex: —
| Benchmark | GPT-5.2 Pro | GPT-5-Codex |
|---|---|---|
| FrontierMath (Tiers 1-3) | 74% | — |
| FrontierMath Tier 4 | 46% | — |
| FrontierMath Tier 4 (v1) | 31.3% | — |
Frequently asked questions
Is GPT-5.2 Pro better than GPT-5-Codex?
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 37.9 on the Noometry Index. GPT-5-Codex costs 17× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.2 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-5.2 Pro lists at $21 and $168.
Which has the bigger context window?
Both accept 400K tokens.
How many benchmarks do GPT-5.2 Pro and GPT-5-Codex share?
0 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and GPT-5-Codex has 3.