Breaking

OpenAI Launches GPT-6 Sol and Luna With Lower API Pricing Than GPT-5.6

September 22, 2026 at 18:36 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI launched GPT-6 Sol and GPT-6 Luna on September 22, expanding the GPT-6 family below Astra and putting the emphasis on cost-performance for coding, agents and high-volume workloads. OpenAI says the new API rates are 50% lower than GPT-5.6 promotional pricing, with Sol at $2 per 1 million input tokens and $10 per 1 million output tokens, and Luna at $0.10 and $0.50.

Sep. 22, 2026 · OpenAI

GPT-6 Moves Down the Cost Curve

Sol and Luna extend GPT-6 into lower-cost tiers for coding agents, long workflows and high-volume tasks while preserving a 1.05M-token context window.

50%

OpenAI-stated API reduction from GPT-5.6 promotional pricing

$2 / $10

GPT-6 Sol input and output per 1M tokens

$0.10 / $0.50

GPT-6 Luna input and output per 1M tokens

1.05M

Token context window listed for both models

Sol Output Price: GPT-5.6 -> GPT-6

Each block represents $2 per 1M output tokens.

$20

GPT-5.6 Sol

$10

GPT-6 Sol

The headline cut is easiest to see in Sol: output pricing falls by half on the published token rate.

Agent Economics Are the Point

90%

discount on cached input reads

30 minutes

eligible cache reuse window

50%

Batch and Flex rates versus Standard

Developer Upside

Cheaper iteration for Codex and long agent sessions
Luna fits focused, high-volume subtasks
Sol targets complex coding and orchestration

Rollout Caveats

Gradual access across ChatGPT Work and Codex
Not yet available in Chat
Evaluation results may differ in production use

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