GPT-5.6 Luna
OpenAIJul 9, 2026N/A
Lightweight speed tier. An aggressive 80% post-launch cut landed it at $0.20/$1.20 per million tokens — among the cheapest frontiers per capability point.
- Status
- Generally available
- License
- Proprietary API
- Context window
- 1.1M
- Max output
- 128K
- Input · $/M
- $0.2
- Output · $/M
- $1.20
- Cached input · $/M
- $0.05
- Blended · $/M
- $0.45
- Parameters
- Undisclosed
- Inputs
- Text + images
Benchmarks
This model has no published scores on the benchmarks we track yet. Specs and pricing below the fold are still fully sourced.
Reasoning & knowledge
GPQA Diamond
no public score
MMLU-Pro
no public score
Humanity's Last Exam
no public score
ARC-AGI-2
no public score
Coding
SWE-bench Verified
no public score
SWE-bench Pro
no public score
LiveCodeBench
no public score
Agents & computer use
Terminal-Bench 2
no public score
OSWorld 2.0
no public score
BrowseComp
no public score
Math
AIME 2026
no public score
Known strengths
- Ultra-low latency
- Pennies-per-task economics