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OpenAI Launches GPT-6 Sol and GPT-6 Luna With Lower API Prices for Codex and Agent Work

September 22, 2026 at 15:29 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 beyond the flagship GPT-6 Astra with cheaper models aimed at coding, agentic workflows and high-volume work. The company says the new models bring some of Astra's advances in professional work, factuality, coding, computer use and alignment to lower-cost tiers, while Astra remains its strongest model overall.

Sep. 22, 2026 · OpenAI

GPT-6 Moves Down The Cost Curve

GPT-6 Sol and GPT-6 Luna bring the new model family into Codex, ChatGPT Work and the API, with lower token prices aimed at agentic coding and high-volume tasks.

50%

API price cut versus GPT-5.6 promotional pricing

1.05M

Token context window for both new models

90%

Discount on cached input-token reads

56.4%

GPT-6 Sol max score on Agents' Last Exam

Sol output price halves

Each block represents $2 per 1 million output tokens.

$20

GPT-5.6 Sol

$10

GPT-6 Sol

What improves

Lower API prices, stronger cost-per-task positioning and broader room to iterate in Codex and agent workflows.

What to watch

Rollout timing, real project retry costs and pending live Arena scores will shape how the launch feels in practice.

Deployment path

API IDs

Codex and Work

Gradual rollout

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