Model Release

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Google released Gemini 4 Argon on 2026-09-30: output limit raised from 64K to 1M tokens, 77.9% on DeepSWE v1.1, and a gated rollout to trusted cyber defenders via the Fairwind Program. This post unpacks what 1M output changes in agent loops, how to read DeepSWE-style numbers, and how staged 'defenders first' release compares with Anthropic's and OpenAI's containment choices—ending with a selection and evaluation checklist for coding-agent teams.

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OpenAI launched GPT-6 Sol and Luna on 2026-09-22: 50% lower API prices versus GPT-5.6 promo rates, with Astra-generation capability and alignment gains. Pricing, benchmarks, caching, and the Astra/Enigma side story—for coding-agent routing.

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Anthropic launched Claude Opus 5.5 on 2026-09-22: about 40% lower cost on typical workloads versus Opus 5, with Fable-tier capability claims and matching safeguards. A builder-focused read of pricing, benchmarks, and coding-agent fit.