**Recurring report from Mozilla**, *The state of open source AI*, **v1.0.1, July 2026**, introduced by a letter from **Raffi Krikorian** (CTO): seven sections, an interactive site, and a downloadable report. Thesis stated in the title of Section 1: *« The model layer has commoditized. Value accrues to the harness above it. »* **Capability state**: on the *Artificial Analysis Intelligence Index v4.1*, the best closed model scores **61** (Claude Opus 5) and the best open model **57** (**Kimi K3**), fourth overall and ahead of three of the largest closed labs; on the *Epoch Capabilities Index*, the gap is **6 points** (K3 at 156 versus GPT-5.6 Sol at 162), described as *« about one release cycle »*, with overlapping confidence intervals. **Sawtooth frontier**: open leads in frontend code (K3 at 1,679 Elo on LMArena Frontend Code Arena, six domains out of seven), contests agentic terminal work (88.3 versus 88.8 on Terminal-Bench 2.1), and cedes ground on professional knowledge work (Fable 5 leads K3 by 92 Elo on GDPval-AA v2). **Usage shift**: the share of OpenRouter tokens routed to open-weight models rose from a negligible level to a third by late 2025, then to a **majority by mid-2026**, with the seven highest-volume models all open-weight — the report itself noting that *« by request count, closed US providers still lead »*, the open lead being a token-volume lead concentrated in coding and agentic workloads. **The central contrast**: *« Open ships easy. Open deploys hard. »* — 79% of developers adding AI use open models versus 71% for closed, but only **53%** of open-model teams reach production **versus 63%**, and the gap widens with organization size (closed 54% → 73%, open 53% → 57%), which *« rules out a resources explanation »*. The stack maturity map (48 components, 9 layers) shows two consistently cold columns — **standardization** and ***enterprise readiness*** — identified as the operational gap. **Section 5**: *« The agentic harness is another user agent »*, and *« The model is eating the harness »* — on every model where both exist, the lab's own harness now wins, the 21.8-point gap having compressed to about 3. Hence the formula: *« A harness tuned tightly to one lab's weights… degrades on anyone else's model, so the tighter the tuning, the less swappable the weights underneath. Lock-in arrives as a side effect of optimization. »*
#Mozilla#state of open source AI#open weights
**Mozilla** — éditeur du rapport · avec une introduction signée **Raffi Krikorian** · *Chief Technology Officer*. Publié en **juillet 2026** (v1.0.1). Données issues de sources tierces créditées (Artificial Analysis, Epoch AI, OpenRouter, LMArena) et d'une enquête propre menée avec **SlashData** (*Mozilla / SlashData 2026 developer survey*, n = 1 410 sur la question des freins).
Article by **Paul Sawers** published on **The New Stack** on **June 16, 2026**, about the **suspension by Anthropic** — *"on the very day it was scheduled to go live"* — of the billing split meant to separate **Agent SDK** usage from Claude subscription limits. **Anthropic's cited message**: *"We're pausing the changes to Claude Agent SDK usage described below. For now, nothing has changed."* **The article's contribution is not the announcement but the surrounding context**, in three circles. **Circle 1 — Anthropic's week**: on June 9, the release of **Fable 5 and Mythos 5**, the first generally available Mythos-class models with hardened cybersecurity safeguards; a few days later, a **US government export control directive** forces Anthropic to **withdraw both models for all its customers worldwide**. The pricing suspension is read as *"a little good news"* in this context. **Circle 2 — collateral damage from the timing**: companies that had already passed the change on to their own customers find themselves caught out; **Conductor**, a multi-agent coding tool built on the Agent SDK, has to issue a denial (*"Anthropic has delayed the subscription updates to Claude plans"*). **Circle 3 — the underlying tension, which extends beyond Anthropic**: a quote from **Boris Cherny** (head of Claude Code) in April, during an earlier restriction, stating that subscriptions *"weren't built for the usage patterns of these third-party tools"* — an admission that **flat-rate plans and open-ended agentic usage don't mix**; **GitHub** settled the matter the same way, removing in June **Copilot**'s flat-rate *premium requests* model in favor of **token-based billing**, despite protests. Added to this, **the same week**, a **proposed class action** was filed in a California federal court, alleging that **Max** tiers fall well short of the usage multipliers advertised for intensive coding sessions. Anthropic does not say when a revised approach will arrive, only that it *"works to update the plan to better support how users build with Claude subscriptions."* **The author's final take**: between government pressure on Fable and Mythos, a planned **IPO**, and **rumored price cuts at OpenAI**, Anthropic is trying to **keep its developer base on its side** — and the suspension is, for now, a means to that end.
#Anthropic#Claude Agent SDK#Claude subscription
**Paul Sawers** — journaliste tech · signe ici pour **The New Stack**. Registre de **presse spécialisée** : l'article ne relaie pas seulement l'annonce · il la replace dans une série (les changements de facturation successifs d'Anthropic) · la compare à un précédent sectoriel (GitHub Copilot) et l'articule à trois pressions concomitantes (export control, IPO, concurrence). Sourçage explicite et attribué — le billet de Zed · l'analyse de Matthew Diakonov · le post de Conductor · une déclaration antérieure de Boris Cherny.