GPT-5.5 Pro vs GPT-5.2 Pro
GPT-5.5 Pro comes out ahead, 65 to 56 on our weighted score, though GPT-5.2 Pro is 14% cheaper per token.
- Our pick
OpenAIGPT-5.5 Pro
65/100- ECI162.4
- Price$30.00 / $180.00
- Context1.05M
- OpenAI
GPT-5.2 Pro
56/100- ECI155.4
- Price$21.00 / $168.00
- Context400K
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Make it a three-way comparison.
GPT-5.5 Pro is our pick
GPT-5.5 Pro is the better all-round choice, scoring 65/100 against GPT-5.2 Pro (56). It leads on capability, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGPT-5.5 ProCapabilities Index (ECI): GPT-5.5 Pro 162.4 · GPT-5.2 Pro 155.4
- Lowest priceGPT-5.2 ProGPT-5.2 Pro $57.75 · GPT-5.5 Pro $67.50 per 1M tokens (3:1 blend)
- Longest contextGPT-5.5 ProGPT-5.5 Pro 1,050,000 · GPT-5.2 Pro 400,000 tokens
- Widest inputsGPT-5.5 ProGPT-5.5 Pro: Text, Images, PDFs · GPT-5.2 Pro: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | GPT-5.5 Pro | GPT-5.2 Pro |
|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 94 | 85 |
| Price | 25% | 0 | 0 |
| Inputs & features | 15% | 80 | 60 |
| Context window | 10% | 61 | 44 |
| Overall | 100% | 65/100 | 56/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.5 ProOpenAI | GPT-5.2 ProOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 162.4 (best) | 155.4 |
| ECI rank | #6 of 148 (best) | #25 of 148 |
| GPQA DiamondGraduate-level science questions | 93.9% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 87.7% (best) | 74.0% |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% | — |
| Price per million tokens | ||
| Input | $30.00 | $21.00 (best) |
| Output | $180.00 | $168.00 (best) |
| Cached input | — | — |
| Blended (3:1) | $67.50 | $57.75 (best) |
| Long-context rate | Over 272K: $60.00 / $270.00 | Same rate |
| Price source | Official OpenAI API | Official OpenAI API |
| Limits | ||
| Context window | 1,050,000 tokens (best) | 400,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | Yesmedium · high · xhigh | Yesmedium · high · xhigh |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | gpt-5.5-pro | gpt-5.2-pro |
| API providers | 19 (best) | 8 |
| Released | Apr 23, 2026 | Dec 11, 2025 |
| Knowledge cutoff | Dec 1, 2025 | Aug 31, 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.5 Pro$660.00
- GPT-5.2 Pro$546.00
Which should you choose?
Which is better: GPT-5.5 Pro or GPT-5.2 Pro?
GPT-5.5 Pro is the better all-round choice, scoring 65/100 against GPT-5.2 Pro (56). It leads on capability, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-5.5 Pro or GPT-5.2 Pro?
GPT-5.2 Pro is cheaper at $21.00 input / $168.00 output per million tokens (official OpenAI API price). GPT-5.5 Pro costs $30.00 input / $180.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $57.75 per million tokens for GPT-5.2 Pro versus $67.50 for GPT-5.5 Pro (1.2× as much).
Which scores higher on benchmarks?
GPT-5.5 Pro scores higher on the Capabilities Index (ECI): GPT-5.5 Pro 162.4 (#6 of 148) and GPT-5.2 Pro 155.4 (#25 of 148). Their confidence ranges do not overlap (159.0–166.0 vs 153.0–158.2), so the gap is a real one. On individual benchmarks: FrontierMath Tiers 1–3 — GPT-5.5 Pro 87.7%, GPT-5.2 Pro 74.0%.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.5 Pro and GPT-5.2 Pro yet, so there is no like-for-like coding score. On overall capability, GPT-5.5 Pro leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.
Which has the bigger context window?
GPT-5.5 Pro has the largest context window at 1,050,000 tokens, against 400,000 for GPT-5.2 Pro. Maximum output per response: GPT-5.5 Pro up to 128,000, GPT-5.2 Pro up to 128,000 tokens.
Which can read images, PDFs, audio or video?
GPT-5.5 Pro accepts text, images and PDFs; GPT-5.2 Pro accepts text and images. GPT-5.5 Pro handles the widest range of inputs.
Are any of these open source?
No. GPT-5.5 Pro and GPT-5.2 Pro are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.5 Pro is the newest, released Apr 23, 2026. GPT-5.2 Pro came out Dec 11, 2025. Knowledge cutoff: GPT-5.5 Pro Dec 1, 2025, GPT-5.2 Pro Aug 31, 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
