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Gemini 4 Argon scores 77.9% on DeepSWE v1.1 — new SOTA above GPT-6 Astra and Opus 5.5. Introductory pricing matches GPT-6.1 Sol at $2/$10 per million tokens. 1M output tokens via Long Decode Continuation. But it's only available to Fairwind Program cyber defenders right now — and they get it without guardrails. Here's what that architecture decision means.
Claude Opus 5.5 launched September 22 at $4/$20 per million tokens — 40% cheaper than Opus 5 on typical workloads, and Fable 5.1-level on most benchmarks. Terminal-Bench ties GPT-6 Astra. Cache reads down 60%. But the 40% savings assume medium effort, there are 5 breaking changes, and one fails silently.
StepFun launched Step 5 Preview on September 20 at $1/$2.70 per million tokens — independently verified by Artificial Analysis at Intelligence Index 44. The 95% cache discount is the most enterprise-relevant number. But every coding benchmark is self-reported, the HF repo is gone, and MiMo-V2.6-Pro is cheaper and higher-scored. Here's the honest breakdown.