GPT-6 LunavsComposer 1.5
GPT-6 Luna | Composer 1.5 | |
|---|---|---|
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 1.05M | — |
| API pricingUSD per 1M tokens · lower wins · base tier | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $0.10 | — |
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. | $0.50 | — |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | $0.01 | — |
| 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 | ||
DeepSWE 1.1Agentic coding — Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | 66.6% | — |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Sep 22 2026 | Feb 9 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
GPT-6 LunavsClaude Opus 5.5Composer 1.5vsClaude Opus 5.5GPT-6 LunavsGemini 3.8 FlashComposer 1.5vsGemini 3.8 FlashGPT-6 LunavsMuse Spark 1.3Composer 1.5vsMuse Spark 1.3GPT-6 LunavsDeepSeek-V4.1-FlashComposer 1.5vsDeepSeek-V4.1-FlashGPT-6 LunavsMistral Medium 3.5Composer 1.5vsMistral Medium 3.5GPT-6 LunavsKimi K3Composer 1.5vsKimi K3
Frequently asked questions
GPT-6 Luna leads Composer 1.5 on 1 of the 1 benchmark they both report (Next.js Evals). Only GPT-6 Luna has a verified first-party API price: $0.10 per million input tokens and $0.50 per million output tokens. No pay-as-you-go API rate is tracked for Composer 1.5. Composer 1.5 shipped 225 days before GPT-6 Luna, 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-6 Luna leads at 77% vs Composer 1.5 at 67%.