Anthropic released Claude Opus 5.5 while OpenAI launched GPT-6 Sol and GPT-6 Luna, both marking a sharp reduction in model pricing that intensifies competition in the large language model market.
- GPT-6 Luna is priced at $0.10/M input and $0.50/M output, half the cost of its predecessor GPT-5.6 Luna.
- GPT-6 Sol costs $2/M input and $10/M output, also halving the price of GPT-5.6 Sol.
- Claude Opus 5.5 is priced at $4/M input and $20/M output, representing a 20% reduction from previous Opus versions.
- Claude Opus 5.5 cache read prices fell by 60%, significantly lowering costs for long agentic conversations.
- Testing revealed that Claude Opus 5.5 at "max" thinking level can hit its 128,000 output token limit during complex reasoning tasks without producing a result.
The new pricing structures make GPT-6 Luna one of the cheapest models available from OpenAI and position Claude Opus 5.5 as a more cost-effective option for high-intelligence tasks.