Anthropic's Claude Opus 5.5 tops coding benchmarks at 66.4% Terminal-Bench, but OpenAI immediately releases GPT-6 Sol at half the price with 68.8% DeepSWE performance and GPT-6 Luna at 1/40th the cost, forcing developers to choose between peak capability and cost-efficient automation.
Anthropic unexpectedly released Claude Opus 5.5, the first 5.5-series model, matching Fable 5.1 performance at 40% lower cost and 30% faster output, while outperforming GPT-6 Astra on Terminal-Bench (66.4% vs 57.9%), FrontierCode, CursorBench, and knowledge-work benchmarks, though high-effort token consumption remains significant.
Anthropic released Claude Opus 5.5 with 40% lower typical workload cost than Opus 5, 60% cheaper cache reads, and leading agentic coding benchmarks (Terminal-Bench 4.0 66.4%), while community tests against GPT-6 Astra and Sol reveal tradeoffs across cost, speed, and output quality in 3D game development and simulation scenarios.
OpenAI launched GPT-6 Sol and Luna while Anthropic released Claude Opus 5.5, all emphasizing lower costs and improved capabilities; the article compares pricing, benchmarks, cache economics, and independent evaluations, advising developers to test models on their own tasks to verify real-world cost per qualified result.
