Eight changes from our past week for people building with AI: two security fixes, a new default, a hosted shutdown and new tools, each with a next step.
Mistral's stateless /v1/responses endpoint returns the answer, reasoning and tool calls as separate items, for its hosted chat models including Large 4.
Canva trained Craft from scratch for layouts and lettering in 55 languages. It is live in Canva and in a preview Connect API endpoint that spends AI credits.
OpenAI's updated Usage Policies say services that give third parties direct access to its models need prior review. Training limits also tighten. From 20 Nov.
Anthropic's first API version since 2023 returns a 400 for temperature, top_p or top_k. New major SDKs send it by default. What breaks and how to stay put.
On Friday OpenAI's API retires a batch of older models announced in April, including gpt-image-1 and the o-series minis. Check your model strings today.
Inception says Mercury 3 matches or beats GPT-6 Luna and Claude Haiku 5.5 while running 4 to 8 times faster. API-only, 50% off at launch, benchmarks self-run.
DeepSeek's API guide documents Search and Fetch at 5 requests a second. The Chinese pages price each at 5 yuan per 1,000 successes; the English pages say $0.75.
Some model names are fixed snapshots and some are pointers that move. How Anthropic and OpenAI name their models, how to tell which kind you are calling, and what even a pinned ID does not freeze.
Google's Gemini API changelog says gemini-3.7-flash now routes to gemini-3.8-flash, and gemini-3.5-flash to gemini-3.6-flash, with no shutdown date. One Deep Research agent ends 23 October.
OpenAI's 2 October 2026 guide tells builders how to pick a GPT-6 model, cache context, and steer long runs. It restates product features and customer stories rather than shipping a new model.
GitHub's 2 October 2026 changelog says Copilot code review is requestable from REST and GraphQL, with an effort level on each call. Balanced, which took effect on 28 September, is the default.
Hosted AI models get switched off, and the providers publish when. How the deprecation pages work at Anthropic and OpenAI, and a routine for never being surprised.
HeyGen Help (updated Sep 30, 2026): first general-purpose HeyGen Video model—T2V, I2V, Ref2V with synced dialogue, ambience, and SFX in one pass. API live now; web soon. Oct 50% promo rates from Help.
Holo4 (Sep 28, 2026): 27B dense (Qwen3.8) + 35B-A3B MoE (Qwen3.6) for GUI/code/MCP/API computer-use. License split: 27B weights CC BY-NC 4.0; 35B-A3B Apache-2.0. Both on H Models API + HF. OSWorld/cost figures are H Company harness claims only. Prefer BF16; context 256K (config max 262,144).