OpenAI
GPT-5.6 Luna
OpenAI's cost-optimized GPT-5.6 tier, repriced 80% lower in July 2026 for high-volume production workloads.
Our editorial assessment, based on the public sources listed below. Last reviewed .
- Overall rank
- #39
- Tier
- A
- Score
- 81.4
- Main category
- Chat
Strengths
- Priced at $0.20 per 1M input tokens and $1.20 per 1M output tokens after the July 30, 2026 cut
- Same 1.05M-token context window and tool suite as the Sol and Terra tiers
- Reasoning effort configurable from none through max on a single model ID
Considerations
- Lower capability ceiling than Sol on complex professional and long-horizon agentic work
- February 2026 knowledge cutoff limits recall of more recent events
Price
$0.20 per 1M input tokens, $1.20 per 1M output tokens
Shown for reference — price is not part of the score.
Score breakdown
- Performance
- 82.0
- 55% of score
- Reputation
- 83.0
- 35% of score
- Recency
- 72.0
- 10% of score
The overall score combines these sub-scores using the weights shown. How we score →
Verification status
Each field carries its own re-verification date. Amber means older than 90 days — treat those figures as stale until re-checked.
Sources
- OpenAI — Introducing GPT-6 Sol and Luna (GPT-5.6 Luna → GPT-6 Luna) (opens in a new tab)Accessed:
- Artificial Analysis — LLM Leaderboard (opens in a new tab)Accessed:
- OpenAI API — Models reference (GPT-5.6 family) (opens in a new tab)Accessed:
- Perplexity Agent API Changelog (opens in a new tab)Accessed:
- OpenAI — GPT-5.6 launch and July 2026 price update (opens in a new tab)Accessed:
Show 4 more sources
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