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GPT-5.6 Luna

Model ● Covered in 27 stories + Follow

GPT-5.6 Luna is an OpenAI model mentioned in recent coverage as one of the GPT-5.6 variants alongside Sol and Terra, with a reported 1 million token context window in Amazon Bedrock inference deployments. It has been used to power features such as Replit’s “Free Mode,” which routes complex requests to more powerful models and then returns to Luna to reduce token consumption. Multiple reports also note OpenAI’s 80% API cost reduction for GPT-5.6 Luna and compare its retrieval quality and performance in agent-oriented retrieval and workload optimization contexts.

Updated 14 September 2026

Specifications

No specifications recorded yet.

Latest developments

Databricks adds adaptive search model to speed agent retrieval SiliconANGLE · 1 week ago · 20
The Pelican comparison grid for Astra is pretty interesting Simon Willison’s Weblog · 1 week ago · 23
Accessing OpenAI models on Amazon Bedrock from Australia with global cross-Region inference Amazon Web Services · 2 weeks ago · 27
Introducing OpenAI models on Amazon Bedrock for in-country inferencing in India Amazon Web Services · 2 weeks ago · 47
Introducing cross-Region inference for OpenAI GPT-5.6 models on Amazon Bedrock Amazon Web Services · 3 weeks ago · 44
AI workload optimization startup Callosum raises $100M SiliconANGLE · 3 weeks ago · 38 Exclusive: Replit taps OpenAI's low-cost Luna model for new 'Free Mode' Fortune · 45 Replit expands access to software creation with GPT-5.6 Luna OpenAI · 4 weeks ago · 13

Timeline

Month Quarter Year

September 2026

OpenAI released GPT-6 Astra, its flagship AI model, along with evaluation results, a system card, and related updates to how the model is benchmarked and priced Model release

AWS enabled access to OpenAI models through Amazon Bedrock in Australia with automatic cross-Region routing, and provided a deployment walkthrough using LiteLLM on Amazon ECS for controlled Codex access Feature update

August 2026

Together AI reported DeepSWE benchmark results comparing GLM-5.3 with GPT-5.6 Sol and Claude Fable 5, including a proposed two-model routing approach Benchmark result

Callosum raises $100 million seed funding led by Atomico to support its AI infrastructure platform Funding

Replit launches a token-cost-free “Free Mode” for software creation powered by OpenAI’s GPT-5.6 Luna Feature update

OpenAI, Google, and DeepSeek released new AI models, alongside price cuts for newly released models by OpenAI and Anthropic Model release

OpenAI releases improved GPT-5.6 models and expands free ChatGPT access with unlimited text chats Feature update

OpenAI announces 80% price reduction for GPT-5.6 Luna and introduces new models with lower pricing Pricing change

July 2026

DeepSeek releases V4-Flash-0731 model with improved agentic and coding performance at reduced pricing Model release

Amazon Bedrock adds advanced prompt optimization and explicit prompt caching features Feature update

OpenAI releases GPT-5.6 model family with efficiency improvements and significant price reductions Model release

OpenAI releases GPT-5.6 family of models (Sol, Terra, Luna) with general availability on Amazon Bedrock Model release

OpenAI releases GPT-5.6 model family with three tiers (Luna, Terra, Sol) and new multi-agent capabilities Model release

OpenAI releases GPT-5.6 model family with improved efficiency and reasoning capabilities Model release

Relationships

Products & technology

  • OpenAI develops this model · 18 sources
  • Amazon Bedrock deploys this model · 4 sources
  • Amazon Bedrock integrated with this model · 2 sources
  • Derived from GPT-5.6 · 1 source
  • OpenAI deploys this model · 1 source
  • Replit integrated with this model · 1 source
  • Free Mode integrated with this model · 1 source

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