AI News — July 13, 2026

Model releases

• [2026-07-13] Anthropic — Fable 5 stays included in Claude subscriptions through July 19; the metered cutover slips to July 20. Fable 5 was due to leave Pro, Max, Team, and select Enterprise plans at 11:59pm PT July 12, moving to usage credits; instead Anthropic extended the included window a second time — now 11:59:59pm PT July 19 — and carried the paired 50% boost to Claude Code weekly limits along with it. The extension applies automatically, with no action required from users. After July 19, Fable 5 moves to usage credits at $10 / $50 per million input/output tokens — the top of Anthropic’s published rate card. Anthropic frames the metered move as temporary: a Claude Code lead engineer said the aim is to restore Fable 5 as a standard part of subscriptions once Anthropic has enough capacity, casting the switch as a demand/capacity constraint rather than a permanent pricing decision. It matters because the last two briefings led with this cutover as a hard July 12 deadline teams were triaging production paths against — the reprieve buys another week, but the load-bearing detail is that capacity, not price, is what now gates whether Fable 5 ever settles back into the included tier. (source, context, official, prior coverage)

  Anthropic’s “temporary” framing has no date attached, so the safe planning assumption is still the meter: a week is enough to benchmark your highest-volume Fable 5 paths against the $10/$50-per-Mtok rate and stand up a fallback, but not to bet on an included tier returning on a schedule nobody has published.

Watch list

• Gemini 3.5 Pro (GA), July 17 target — four days out and still a limited Vertex AI preview, with no model card, published benchmarks, or pricing for the promised 2M-token context and Deep Think mode. Reporting continues to tie the date to a full architectural rebuild that scrapped the 2.5 Pro base; Google has confirmed none of it. It remains the only major summer flagship still entirely unlaunched, so watch for whether even a model card lands before the 17th. (unconfirmed) (prior coverage)

  A 2M-token window at GA would roughly double the working context most teams design around, but a preview with no card, benchmarks, or pricing isn’t something you can plan against — the signal that this becomes real is a model card with published numbers, not another date slipping into view.

• GPT-5.6 first independent benchmarks — Sol/Terra/Luna are in broad GA use, but every public performance figure still traces back to OpenAI’s own numbers. Muse Spark 1.1, Grok 4.5, and Opus 4.8 now carry published scores on the same coding suites (SWE-Bench Pro, Terminal-Bench, DeepSWE); watch for the first neutral eval that runs those against Sol. (prior coverage)

  Vendor-run figures are normal at launch; what turns this into an actionable comparison is a neutral eval placing Sol on SWE-Bench Pro and DeepSWE next to Opus 4.8 and Grok 4.5, since that’s the first point you can size GPT-5.6 for real coding work instead of taking OpenAI’s own numbers on faith.

• MCP spec finalization (July 28) — the 2026-07-28 release candidate (stateless core, Extensions framework, Tasks, MCP Apps, authorization hardening) is in its validation window, with the Python/TypeScript/Go/C# SDKs updating against it in beta. Watch for the remaining SDK support landing and any last changes to the new Mcp-Method/Mcp-Name HTTP headers that security analysts have flagged as fresh attack surface. (official, prior coverage)

  For anyone building on MCP, the header changes are the part with teeth: once the RC locks on July 28 those headers become surface your gateway and auth layer have to validate, so the moment worth acting on is stable SDK support shipping alongside a header design that survives the validation window unchanged.