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Claude Opus 5.5 and GPT-6 Sol launched 90 minutes apart on 22 Sept 2026. Opus 5.5 wins on benchmarks; Sol costs half per token. Pricing, cost per task, shared benchmarks, Claude Code vs Codex, and which to pick.

Claude Opus 5.5 launched 22 September 2026: model IDs on every platform, 1M context, $4/$20 pricing vs Opus 5 and Fable 5.1, the new medium effort default, full benchmark table, Artificial Analysis ranking and its token-usage catch, and system-card . ...

DeepSeek-V4.1-Flash (10 Sept 2026): 552B MoE with 8B/16B active, 1M context, MIT weights, $0.30/$1.20 per 1M peak. Why V4-Pro was not deprecated after all, what the 90.6 Terminal-Bench score really means, and what running it locally takes.

Meta Muse is Meta's personal AI agent app, launched 8 Sept 2026 on Muse Spark 1.3. What it does, how the Secure VM and Sentinel work, pricing, Muse for Mac, Muse Connectors, privacy, and how it compares with Claude Cowork and Gemini Spark.

Migrating from Claude Opus 5 to Opus 5.5: thinking can't be disabled, forced tool_choice returns 400, thinking blocks are bound to the conversation, computer_20251124 is rejected, and effort defaults to medium. Exact errors, before/after code, costs, ...

Claude Opus 5.5, GPT-6 Astra and Grok 4.7 compared on list, cache and long-context pricing, context windows, shared benchmarks, Artificial Analysis cost per run, and availability, plus a decision table by workload.

Grok 4.7 explained: the grok-4.7 model ID, 500k context, $2/$6 pricing with the 200k tier and Fast variant, xAI vs Artificial Analysis benchmarks, API quickstart, availability and who should use it.

Xiaomi's MiMo-V2.6-Pro is the new top open-weight model: 1.02T/42B MoE, 1M context, MIT licence, AA Index 46, $0.435/$0.87 API. Specs, benchmarks, hardware, comparison with Kimi K3, Qwen 3.8 Max, DeepSeek V4.1 Flash and GLM-5.3.

Grok 4.7 vs Grok 4.6: same $2/$6 price and 500K context, a new larger base model, +17 points on Terminal-Bench, but ~2.25x the tokens per task. Specs, benchmark deltas, real cost per task, API migration, and the Grok 4.8 outlook.