GPT-5.5-ProvsComposer 1.5
GPT-5.5-Pro | Composer 1.5 | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $30.00 | — |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $180.00 | — |
| Benchmarks | ||
Next.js EvalsNext.js coding — Vercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 77% | 67% |
| BenchmarksPublished by one model only | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 36% | — |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | 90.1% | — |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | 57.2% | — |
FrontierMath · Tier 1–3Advanced math — Very hard, research-level math problems. Tiers 1–3 are the (still extremely difficult) lower tiers. Higher is better. | 52.4% | — |
FrontierMath · Tier 4Advanced math — Very hard, research-level math problems. Tier 4 is the hardest — close to what professional research mathematicians tackle. Higher is better. | 39.6% | — |
GDPval (win/tie rate)Knowledge work — How often the AI's work matches or beats a human expert's on real knowledge-work tasks. Higher is better. | 82.3% | — |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Apr 23 2026 | Feb 9 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
GPT-5.5-ProvsClaude Fable 5.1Composer 1.5vsClaude Fable 5.1GPT-5.5-ProvsGemini 3.8 FlashComposer 1.5vsGemini 3.8 FlashGPT-5.5-ProvsMuse Spark 1.3Composer 1.5vsMuse Spark 1.3GPT-5.5-ProvsDeepSeek-V4-Pro-0813Composer 1.5vsDeepSeek-V4-Pro-0813GPT-5.5-ProvsMistral Medium 3.5Composer 1.5vsMistral Medium 3.5GPT-5.5-ProvsKimi K3Composer 1.5vsKimi K3
Frequently asked questions
GPT-5.5-Pro leads Composer 1.5 on 1 of the 1 benchmark they both report (Next.js Evals). Only GPT-5.5-Pro has a verified first-party API price: $30.00 per million input tokens and $180.00 per million output tokens. No pay-as-you-go API rate is tracked for Composer 1.5. Composer 1.5 shipped 73 days before GPT-5.5-Pro, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On Next.js Evals, GPT-5.5-Pro leads at 77% vs Composer 1.5 at 67%.