Breaking

OpenAI Launches GPT-6 Sol and Luna With Lower API Pricing for Agents and Coding

September 23, 2026 at 18:16 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI launched GPT-6 Sol and GPT-6 Luna on September 22, 2026, positioning them as lower-cost GPT-6 models for coding agents, business workflows and high-volume automation. The company says API prices for both models are 50% below GPT-5.6 promotional pricing, while Sol is benchmarked above Claude Opus 5 on AutomationBench at 9% of Opus 5's cost per task.

Sep 22, 2026 · OpenAI

GPT-6 Sol and Luna push agent work down the cost curve

Two GPT-6 models target coding, business workflows and high-volume automation with API prices 50% below GPT-5.6 promotional pricing.

50%

API price reduction versus GPT-5.6 promotional pricing

$0.27

GPT-6 Sol cost per AutomationBench task at xhigh effort

1.05M

Context tokens listed for both new models

128K

Maximum output tokens in the API model pages

AutomationBench cost gap

Task cost is shown as stacked blocks, with GPT-6 Sol normalized to 1x.

GPT-6 Sol
$0.27/task

11.1x

Claude Opus 5
cost per task

Sol pairs a higher AutomationBench score with 9% of Opus 5's task cost.

Same-benchmark score

A proportional block view of AutomationBench scores.

33.2%

GPT-6 Sol
xhigh effort

26.9%

Claude Opus 5
max effort

Why builders noticed

Lower token prices, cheaper cached reads and Luna's high-volume positioning make longer agent runs easier to justify.

What remains unsettled

Hands-on reports were mixed, and Claude Opus 5.5 complicates the cross-model scorecard.

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