Model comparison
GPT-5.2 Pro vs o3-pro
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 42.9 on the Noometry Index. o3-pro costs 1.6× less per token, which makes it the better buy when GPT-5.2 Pro's lead doesn't matter for your workload.
Last verified . 3 shared benchmarks.
Summary
- They share 3 benchmarks with published results for both. GPT-5.2 Pro scores higher in 1 category and o3-pro in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.2 Pro leads 51.5 to 23.8.
- The biggest single-benchmark swing is ARC-AGI-2: 54.2% for GPT-5.2 Pro and 4.9% for o3-pro.
- o3-pro is cheaper at $20 / $80 per million input/output tokens, against $21 / $168 for GPT-5.2 Pro.
- GPT-5.2 Pro accepts more context: 400K tokens versus 200K.
Side by side
| GPT-5.2 Pro | o3-pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 52.3 | 42.9 |
| Released | 2025-12-11 | 2025-06-10 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $21 | $20 |
| Output $ / M tokens | $168 | $80 |
| Results tracked | 8 | 12 |
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Category by category
Coding Not comparable
GPT-5.2 Pro: —, o3-pro: 55.5 (#24)
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |
Reasoning GPT-5.2 Pro leads
GPT-5.2 Pro: 51.5 (#33), o3-pro: 23.8 (#171)
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| ARC-AGI-2 | 54.2% | 4.9% |
| ARC-AGI-1 | 90.5% | 59.3% |
| Epoch Capabilities Index | 155.4 | 147.42 |
| SimpleBench | 57.4% | — |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 79.3% | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
Math Not comparable
GPT-5.2 Pro: 65.3 (#29), o3-pro: —
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 74% | — |
| FrontierMath Tier 4 | 46% | — |
| FrontierMath Tier 4 (v1) | 31.3% | — |
Knowledge Not comparable
GPT-5.2 Pro: —, o3-pro: 29.5 (#238)
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
Long Context Not comparable
GPT-5.2 Pro: —, o3-pro: 72.2 (#1)
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
Writing & Preference Not comparable
GPT-5.2 Pro: —, o3-pro: 57.1 (#133)
| Benchmark | GPT-5.2 Pro | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
Frequently asked questions
Is GPT-5.2 Pro better than o3-pro?
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 42.9 on the Noometry Index. o3-pro costs 1.6× 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 o3-pro?
o3-pro is cheaper. It lists at $20 per million input tokens and $80 per million output tokens; GPT-5.2 Pro lists at $21 and $168.
Which has the bigger context window?
GPT-5.2 Pro does, with 400K tokens against 200K.
How many benchmarks do GPT-5.2 Pro and o3-pro share?
3 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and o3-pro has 12.