GPT-5.6 Luna
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openai/gpt-5.6-luna · by OpenAI · decoder-only-transformer
Pricing — 1 offering(s)
Input tokens
- $1.00 / 1M tokens (input) Current 2026-07-10 → present
Output tokens
- $6.00 / 1M tokens (output) Current 2026-07-10 → present
Showing the active price and any recorded history. Full pricing history is available via the paid API — see API docs.
Capability profile
reasoning weak
coding moderate
tool use strong
context window strong
speed strong
cost efficiency strong
Coding benchmarks
View full leaderboard →| Benchmark | Score | Harness | Source |
|---|---|---|---|
| swe-bench-verified ↗ | 93.0% 2026-07 | — | 📊 leaderboard ↗ |
Operator guidance
The cost-optimized tier of the GPT-5.6 family (launched 2026-07-10 alongside Sol and Terra). Route here for throughput and cost; step up to Terra or Sol when a task needs more reasoning or coding depth than Luna reliably provides.
Use cases
- Cost-sensitive, high-volume workloads — OpenAI's own positioning for this tier
Limitations
- instruction-following and multilingual ratings omitted — re-checked 2026-07-20 (live browser fetch of openai.com/index/gpt-5-6/ in full, the OpenAI Help Center's 'GPT-5.6 in ChatGPT' article, and the GPT-5.6 system card at deploymentsafety.openai.com/gpt-5-6) and still no distinct per-tier claim exists on any OpenAI-owned page for either dimension; rather than infer a rating, this doc leaves them out
- speed rating added 2026-07-20 (previously omitted) — a fuller re-read of the GA launch page's 'Availability and pricing' section (not just the per-tier spec pages the original pass checked) found 'Luna, our fastest and most affordable model,' a genuine distinguishing claim the original pass had missed; superseding the earlier note about the dropped preview-post adjective, which is no longer the operative source
- Capability ratings are qualitative, not a single cited benchmark run