OpenAI halves GPT-6 prices an hour after Anthropic ships Opus 5.5

single source· 1 articles · confidence: medium · first seen 2026-09-22 23:46 UTC

What this means for you

If you serve traffic on GPT-5.6 Sol or Luna, the listed replacements cost half as much per token, and GPT-5.6 prices are scheduled to rise 25% in November anyway. Wait for evaluations before migrating: none of the three models has a published score yet.

Anthropic released Claude Opus 5.5 on 22 September, and OpenAI released GPT-6 Sol and GPT-6 Luna roughly an hour later, both new OpenAI models priced at half their GPT-5.6 equivalents. GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output, against $0.20 and $1.20 for GPT-5.6 Luna; GPT-6 Sol is $2 and $10, against $4 and $20. Claude Opus 5.5 is listed at $4 and $20. GPT-5.6 prices are scheduled to rise 25% in November. The source is first impressions, with no evaluation scores.

Models in this story

Key facts

  • ·Anthropic released Claude Opus 5.5 on 22 September 2026, and OpenAI released GPT-6 Sol and GPT-6 Luna about an hour later. source
  • ·GPT-6 Luna is priced at $0.10 per million input tokens, $0.01 cached input and $0.50 output; GPT-5.6 Luna was $0.20, $0.02 and $1.20. source
  • ·GPT-6 Sol is priced at $2 per million input tokens, $0.20 cached input and $10 output; GPT-5.6 Sol was $4, $0.40 and $20. source
  • ·Claude Opus 5.5 is listed at $4 per million input tokens, $0.20 cached input and $20 output. source
  • ·GPT-5.6 has a scheduled 25% price increase for November 2026. source
  • ·Among OpenAI models, only GPT-4.1 Nano ($0.10/$0.40, April 2025) and GPT-5 Nano ($0.05/$0.40, August 2025) are listed at lower prices than GPT-6 Luna. source

What the sources say

  • Simon Willison — Early impressions of three same-day model launches, with a full comparison price table.

Sources

The original reporting. Follow these — they did the work.

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