Model comparison
GPT-5.1-Codex vs GPT-5.2 Pro
GPT-5.2 Pro is the stronger model overall, scoring 52.2 to 38.2 on the Noometry Index. GPT-5.1-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 math, where GPT-5.2 Pro leads 64.8 to 29.3.
- GPT-5.1-Codex is cheaper at $1.25 / $10 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
Side by side
| GPT-5.1-Codex | GPT-5.2 Pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 38.2 | 52.2 |
| Released | 2025-11-12 | 2025-12-11 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 400K |
| Max output | 128K | 128K |
| Input $ / M tokens | $1.25 | $21 |
| Output $ / M tokens | $10 | $168 |
| Results tracked | 6 | 8 |
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Category by category
Coding Not comparable
GPT-5.1-Codex: 41.7 (#107), GPT-5.2 Pro: —
| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |
Agentic & Tool Use Not comparable
GPT-5.1-Codex: 37.8 (#32), GPT-5.2 Pro: —
| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, GPT-5.2 Pro: 51.8 (#31)
| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| ARC-AGI-2 | — | 54.2% |
| SimpleBench | — | 57.4% |
| NYT Connections (extended) | — | 79.3% |
| ARC-AGI-1 | — | 90.5% |
| Epoch Capabilities Index | — | 155.41 |
Math GPT-5.2 Pro leads
GPT-5.1-Codex: 29.3 (#218), GPT-5.2 Pro: 64.8 (#23)
| Benchmark | GPT-5.1-Codex | GPT-5.2 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 74% |
| FrontierMath Tier 4 | — | 46% |
| ProofBench | 9% | — |
| FrontierMath Tier 4 (v1) | — | 31.3% |
Frequently asked questions
Is GPT-5.1-Codex better than GPT-5.2 Pro?
GPT-5.2 Pro is the stronger model overall, scoring 52.2 to 38.2 on the Noometry Index. GPT-5.1-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-5.1-Codex or GPT-5.2 Pro?
GPT-5.1-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-5.1-Codex and GPT-5.2 Pro share?
0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and GPT-5.2 Pro has 8.