GPT-6 Luna priced at $0.10/$0.50, half of GPT-5.6, as Anthropic and OpenAI spark a price war
altryne · x · 2026-09-23
Simon Willison reviews the same-day releases of Claude Opus 5.5 and GPT-6 Sol/Luna, highlighting a new price war:
- GPT-6 Luna costs $0.10/M input and $0.50/M output — half of GPT-5.6 Luna ($0.20/$1.20) and among the cheapest models OpenAI has ever shipped, behind only the far weaker GPT-4.1 Nano and GPT-5 Nano
- GPT-6 Sol lands at $2/$10, a steep cut from GPT-5.6 Sol's $4/$20; the identically priced GPT-5.6 Terra now has no reason to exist
- Claude Opus 5.5 is priced $4/$20 with $0.20/M cached input
- Grok 4.7's earlier $2/$6 undercut now only matches GPT-6 Sol on input
- Top tier: Claude Fable 5.1 and GPT-6 Astra both at $10/$50
GPT-5.6 was also due a scheduled 25% price increase in November, making GPT-6 effectively half of even the promotional pricing. Willison also compares pelican-drawing quality across model families at different reasoning levels.
More from Models
- Google's Physical-Engineering's Last Exam: all 14 frontier models score below 50% — dl_weekly · 2026-11-12
- Commit leak reveals unreleased Gemini 4 variants: Argon, Hydrogen and Helix (unconfirmed) — BlackHC · 2026-11-11
- Rewiring just 89 of 442,368 neurons in Qwen3-8B matches full SFT for a persona — maxsloef · 2026-11-11
- Unsloth ships Qwen3.8-27B Dynamic V3.1 GGUFs with 5-10% accuracy gains — danielhanchen · 2026-11-11
- Zvi: being forced back to an older model is the best reminder of AI progress — TheZvi · 2026-11-11
- Screenshots Made a 4B Browser Agent Worse: A Postmortem With Real Numbers — Stunning-Sherbet1853 · 2026-11-11