GPT-5.6 Luna :free

gpt-5.6-luna:freeby GPTrecommendedFree

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Context

1.05M

Max output

128K

Pricing

Fastest

60 tok/s

Released

Jul 2026

Promotion

FreeYour limits

Selected gpt-5.6-luna:free. Requests stop when the free allowance is unavailable or exhausted. They never fall back to paid usage.

Only routes covered by a free allowance or a zero-price provider are eligible. Paid routes and credit overflow do not apply to this selection. View regular model routes and settings.

Supported parameters

Sampling

Temperature0-2 · reasoning off onlyTop-p0-1

Tools & structure

ToolsStrict toolsParallel tool callsStructured output

Reasoning

Quickstart

I want you to route my LLM calls for "gpt-5.6-luna:free" through the Experiential gateway instead of
calling the provider directly. It speaks the OpenAI Chat Completions API, so this is a base-URL
and key swap. Please:

1. Point the client at https://api-pr-2136.preview.experientiallabs.ai/v1 as the base URL.
2. Authenticate with my Experiential API key from the EXPLABS_API_KEY environment variable. If
   it isn't set, stop and tell me to create one under Settings -> API Keys and export it.
3. Use the model id "gpt-5.6-luna:free" exactly.
4. Update every place my code builds an LLM client for this model to use that base URL and key,
   leaving streaming and tool-calls as they are.
5. Make one test call and confirm the reply has zero cost. Stop if the free allowance is unavailable.

Tell me which files you changed.

Set EXPLABS_API_KEY to an organization API key before running your agent.

Benchmarks

Release notes

MMLU-Propublic leaderboard · Aug 202686.5%
GPQA Diamondvendor reported · Aug 202692.3%
SWE-bench Verifiedpublic leaderboard · Aug 202693.0%
LiveBenchpublic leaderboard · Aug 202673.6%
AIME 2025public leaderboard · Aug 202699.2%
MATH-500public leaderboard · Aug 202693.7%
LMArena EloLMArena · Aug 20261429
Terminal-Benchvendor reported · Aug 202684.7