GPT-5.6 Luna API
About
Build advanced reasoning agents with GPT-5.6 Luna, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.20/1M input and $1.20/1M output tokens, native tool calling support. Access GPT-5.6 Luna via the Merge Gateway API with up to 128K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Limits
Context Window
1.1M
Tokens
Input Limit
922K
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.20
Output
$1.20
Caching (per 1M tokens)
Read
$0.02
Frequently Asked Questions
GPT-5.6 Luna by Merge Gateway costs $0.20 per 1M input tokens and $1.20 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.
Model Details
ID
openai/gpt-5.6-luna
Provider
Merge GatewayFamily
gpt-luna
Release Date
Jul 9, 2026
Knowledge Cutoff
Feb 16, 2026
API Integration
NPM Package
merge-gateway-ai-sdk-provider
Environment Variables
MERGE_GATEWAY_API_KEY
API Base URL
https://api-gateway.merge.dev/v1/ai-sdk