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DeepSeek released V4.1 Flash on September 10, 2026 and is routing its own V4 Pro flagship to it four days later at Flash prices. A 552B backbone that activates 8B parameters to read and 16B to write, native vision, an 890-byte-per-token KV cache, and a scaffold table showing the same model swing 8.7 points on one benchmark depending on the agent harness.
GPT-6 Astra dominates several math, computer-use, and execution benchmarks, while Claude Fable 5.1 leads independent intelligence and coding-agent evaluations. Here’s when to use each.
Muse Spark 1.3 ties GPT-5.6 Sol and Claude Opus 5 on an independent index at about half the cost per task, leads on long-context retrieval and coding, and offers a $0.10 contributor tier in exchange for training on your prompts. What the numbers show and what to check first.
Gemini 3.8 Flash leads Claude Opus 5 on Google’s finance, legal, and chart benchmarks and trails it badly on the hardest agentic coding test, at a fifth to a seventh of the per-token price. What changed, what it costs, and how to choose.
Anthropic’s Fable 5.1 is an endurance upgrade: big gains on long-running agentic tasks, unchanged token prices but far cheaper cache reads, a restricted Mythos 5.1 for vetted defenders and scientists, and safeguards that flag benign requests far less often.
There is no announced DeepSeek V5. What the V4 line already shipped, how to read the official change log, and how to plan without a version number.
OpenAI released GPT-6 Astra on September 3, 2026. Here is the complete guide to its price, API pricing, 1.05M-token context window, benchmarks, features, rollout, computer use, and Critical cybersecurity rating.
Meta has not announced Llama 5. What shipped instead - Llama 4 and Muse Spark - why the name probably changed, and how to plan without a release date.
There is no Qwen 4 - Alibaba ships point releases in the 3.x line instead. What Qwen3.8 delivers, which open weights exist, and how to plan around it.
There is no Veo 4 - Google now recommends Gemini Omni Flash for video and positions Veo 3.1 for specific jobs. How to choose a video model today.