Cursor (@cursor_ai) announced Claude Opus 5.5 is available in Cursor. Officially it is the new top model on CursorBench at 57.8% (Max) and costs about 40% less per task than Opus 5, wiring Anthropic’s same-day Opus 5.5 launch into a leading AI IDE.
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Anthropic launched Claude Fable 5.1 on September 1 (API id claude-fable-5-1) for Pro, Max, Team, and Enterprise, plus the Claude API, AWS, Google Cloud, and Microsoft Foundry. List price stays $10 input / $50 output per 1M tokens, but cache reads drop to $0.25 (75% less than Fable 5), which Anthropic estimates cuts typical workloads about 25% and highly agentic ones up to about 45%. Claude Mythos 5.1 remains limited to trusted-access programs.
@ArtificialAnlys evaluated StepFun Step 5 Preview (600B-total / 27B-active MoE): Artificial Analysis Intelligence Index 44, matching Kimi K3 (max) at about $0.72 per Index task (~2.8x cheaper). Pricing is about $1/$2.70 per 1M input/output tokens with $0.05/M cached input; 1M context; open weights planned for October 15. It still lags peers on agentic evals such as GDPval-AA and Terminal-Bench 4.0.
@ArtificialAnlys reports Xiaomi released open-weights MiMo-V2.6-Pro: Artificial Analysis Intelligence Index 46 (up from 26 on V2.5-Pro), now the top open-weights model, landing on the intelligence-vs-cost Pareto frontier at about $0.13 per Index task with unchanged token prices ($0.435/M input with 99% cache-hit discount, $0.87/M output). It is a 1.02T-total / 42B-active MoE.
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