Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 400k | — |
| 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. | 46% | 67% |
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. | 45% | — |
| Overview | ||
| Company | OpenAI | SpaceXSI |
| Release date | Dec 18 2025 | Feb 9 2026 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
GPT-5.2-CodexvsClaude Fable 5.2Composer 1.5vsClaude Fable 5.2GPT-5.2-CodexvsGemini 4 CarbonComposer 1.5vsGemini 4 CarbonGPT-5.2-CodexvsMuse EmberComposer 1.5vsMuse EmberGPT-5.2-CodexvsDeepSeek-V4.1-Flash-1017Composer 1.5vsDeepSeek-V4.1-Flash-1017GPT-5.2-CodexvsMistral Large 4Composer 1.5vsMistral Large 4GPT-5.2-CodexvsKimi K3.1 ProComposer 1.5vsKimi K3.1 ProFrequently asked questions
Composer 1.5 leads GPT-5.2-Codex on 1 of the 1 benchmark they both report (Next.js Evals). GPT-5.2-Codex shipped 53 days before Composer 1.5, 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, Composer 1.5 leads at 67% vs GPT-5.2-Codex at 46%.