GPT-6 Luna is OpenAI's lowest-cost current model, built for focused, high-volume work such as classification, extraction and routing. OpenAI names it as the replacement for GPT-4o and GPT-4o mini, which shut down on 14 January 2027.
GPT-6 Luna
OpenAI's most efficient model for focused, high-volume tasks
Checked 2026-11-12 against OpenAI's documentation
| Provider | OpenAI |
| Status | Current |
| Context window | 1.05M tokens |
| Pricing | Paid |
| Input price | $0.10/M |
| Output price | $0.50/M |
| Capabilities | textvisioncodefunction-calling |
| API docs | Docs ↗ |
Benchmarks
Benchmark data not yet available for this model.
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Compare with similar models
| GPT-6 Luna | Claude Opus 4.6 | Gemini 2.5 Pro | Claude Fable 5.2 | |
|---|---|---|---|---|
| Context | 1.05M | 200K | 1.05M | 1M |
| MMLU | — | 92.0 | 91.0 | — |
| HumanEval | — | 94.5 | — | — |
| MATH | — | 97.1 | 97.0 | — |
| GPQA | — | 79.9 | 84.0 | — |
| Pricing | Paid | Paid | Paid | Paid |
| Input $/M | $0.10 | $15.00 | $1.25 | $8.00 |