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Claude Opus 5.5 and competing AI model pricing comparison, September 2026
Photo: TechMyMoney

OpenAI Cuts GPT-6 API Prices 50% With Sol and Luna Launch

Anthropic2 min read8 sources

Why did OpenAI cut API prices 50%?

OpenAI (private) cut its GPT-6 API prices 50% to $2.00/M tokens on Tuesday after rival Anthropic launched Claude Opus 5.5 at 40% less, igniting a live frontier-AI price war.

Key numbers

GPT-6 Sol input price$2.00/M tokens-50% from GPT-5.6 Sol at $4.00/M
GPT-6 Luna input price$0.10/M tokens-50% from GPT-5.6 Luna at $0.20/M
Claude Opus 5.5 input price$4.00/M tokens-20% list; ~-40% effective workload cost vs. Opus 5 ($5.00/M)
GPT-6 cached input discount90% off standard rateGitHub: fresh token processing halved across billions of requests (per [1] only)
Anthropic annualized revenue$65BJuly 2026 run rate; $120B+ projected by year-end (per [5] only)
Frontier AI API cost decline~90–97%for equivalent intelligence since early 2024

What happened

OpenAI (private) cut its GPT-6 API prices 50% to $2.00/M tokens on Tuesday after rival Anthropic launched Claude Opus 5.5 at 40% less, igniting a live frontier-AI price war. OpenAI's two new models — Sol, a mid-tier workhorse, and Luna, a lightweight option at just $0.10 per million input tokens — arrived roughly 90 minutes after Anthropic's Opus 5.5. Anthropic cut its flagship list price 20% (from $5.00 to $4.00 per million input tokens), and customers running typical agent workloads should see about 40% lower total bills once faster output and caching improvements are included. Neither company is publicly traded; both are racing to lock in enterprise customers ahead of upcoming IPOs.

Why it matters

API prices are how businesses pay to use artificial intelligence by the token — today's cuts mean companies can now run OpenAI's flagship AI at half last month's cost. For enterprises, this speeds up automation investment; for the broader economy, prices that have already fallen roughly 90% since early 2024 are falling further, squeezing the revenue outlooks both companies need to justify IPO valuations of $1 trillion or more. The price war shows that even dominant AI labs are willing to sacrifice margins to win enterprise market share before going public.

Who this affects

Marketmixed
Medium impact
Public AI backers Microsoft and Google face margin pressure.
Companymixed
High impact
OpenAI wins price edge; own margins compress ahead of IPO.
Competitorsbearish
Medium impact
Anthropic, Google, and DeepSeek face pressure to match deeper cuts.
Industrybullish
High impact
Cheaper frontier AI accelerates enterprise adoption across every sector.

OpenAI vs Anthropic, Google, DeepSeek

OpenAI (GPT-6 Sol)private~$1.2T$2.00$10.00-50%
Anthropic (Claude Opus 5.5)private~$965B$4.00$20.00-40% eff.
Google (Gemini 3.1 Pro)GOOGL~$2.3T$2.00$12.00—
DeepSeek (V4.1 Flash)privateprivate$0.15~$0.60—

As of 2026-09-23

How we got here

  1. Frontier AI API costs begin 90%+ multi-year decline for equivalent capability

  2. GPT-5.6 launch: OpenAI overtakes Anthropic on OpenRouter for first time in 2.5 years

  3. Anthropic pushes IPO timeline from October to November 2026

  4. Anthropic launches Claude Opus 5.5 at $4.00/M input, ~40% cheaper on typical workloads

  5. OpenAI releases GPT-6 Sol ($2.00/M) and Luna ($0.10/M), each 50% below prior GPT-5.6 pricing

What to watch

  • Anthropic IPO roadshow: will valuation hold above $1.5T amid margin compression?November 2026
  • Google and DeepSeek pricing response to the dueling 40–50% cutsQ4 2026
  • Enterprise API adoption data: does volume growth offset margin compression for both labs?Q4 2026

Educational content only. Not investment advice.

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