The State of Open Source AI

Changelog.

Open source AI is changing at a rapid pace. We update this report as new developments come to light, and log every change here, newest first. Each entry records what was added, what changed, and what was retired, so you can tell which edition a given number came from. Past editions stay downloadable in the archive at the foot of this page.

v1.0.1 27 July 2026 The K3 patch

Moonshot shipped a frontier-class open model, API on 16 July and weights on 27 July, between v1.0 and this release.

Net change · 9 added · 2 removed · 1 replaced in place
Added
Section 01 · The current state
  • A new capability-benchmark suite, replacing the Chatbot Arena framing.
    • "The frontier's top three are closed. The fourth is open." Artificial Analysis Intelligence Index v4.1. Kimi K3 debuts at #4, four points off the closed frontier, ahead of Opus 4.8, GPT-5.6 Terra, Grok 4.5 and Sonnet 5.
    • "The intelligence index, priced." Score against price per 1M input tokens. K3 is flagged as the only open model in the leading cluster, with a footnote that Fable 5 and Sol are deployed-system configurations, so the comparison is system against model.
    • "Open trails the frontier by 6 ECI points, about one release cycle." Epoch Capabilities Index with 90% confidence intervals, which overlap.
  • "The open frontier and the deployable open frontier split." New serving-footprint view. K3 needs roughly eight nodes and 1.4 TB, Inkling fits one node. Introduces the deployability line.
  • K3 availability flag on the token-usage leaderboard. API 16 July, weights 27 July, new subscriptions paused 20 July near capacity, and absent from July's routed-token top 20.
  • "The K3 exception" panel on the inference-cost view. List price above the tier median, roughly $0.95 per completed task, about level with GPT-5.6 Sol. The open discount now lives in caching, sparsity and workload shape.
Section 02 · Who's betting on it
  • Thinking Machines Lab added to the venture-funding chart at $2,000M, US.
  • Valuation annotations. Moonshot's $31.5B ask, up from $20B in May, and TML at roughly $12B at Inkling's release.
Section 03 · Why it's happening everywhere
  • "Washington cannot un-release a model either." New policy view. Treasury opens the door to sanctions on 21 July, five enforcement tools are under consideration, and the no-chokepoint problem is set out.
Section 04 · The harness is the new frontier
  • "Timeline of the Kimi K3 and Fable distillation claims." Separates the documented, being the February 2026 disclosure of roughly 24,000 fraudulent accounts and more than 16M exchanges, from the alleged Fable-to-K3 extraction, with an analysis of the roughly 18-day reachability window.
  • "The similarity signal within Kimi K3." Three independent instruments, each with stated limits: self-identification as Claude 4.5 (Greenblatt / Redwood), 0.72 per-task pass/fail correlation with Fable 5 (Together AI), and 82.7% agentic similarity between Kimi-K2 and Sonnet 4.5 (arXiv).
  • "An open model ran the defense." The 16 July OpenAI cyber-eval escape and the Hugging Face breach that followed. Commercial frontier APIs refused the forensic work, so Hugging Face ran forensics on self-hosted GLM 5.2.
  • "Two open frontiers, two release cultures." Inkling against K3 on license clarity, weights-to-API order, serving footprint and evidence at launch.
Changed
  • Cover. Volume 1.0 becomes 1.0.1.
  • "For nineteen days, the newest frontier model went dark." Restructured from prose into an event timeline. Adds the 16 July K3 launch as the closing beat and a new mirror panel on revocable access against irreversible weight release. Sources added.
  • "Open proliferation is Chinese industrial policy" becomes "… is now Chinese foreign policy." Major rewrite covering the WAICO founding with 29 states and a Shanghai headquarters and no major Western democracy, Xi's first WAIC keynote, 5,000 AI-training slots for developing countries, K3 as the July exhibit, and the 46.4% against 35.7% CN/US routed-token split. Closes on the warning that a single-origin open commons stops being a commons.
  • "The model is eating the harness." Substantially rewritten. Adds K3 at 88.3 on Terminal-Bench 2.1, half a point behind Sol, inside its own harness. Adds the score-is-a-property-of-the-pair analysis covering harness sensitivity, vendor notes and universality, and a KDA to vLLM prefix-caching flow showing labs competing to define the serving standard.
  • Token-usage leaderboard refreshed from June to July 2026. MiMo-V2.5 takes first place at 31.2T, up 115%. The top seven by volume are now all open weight, where it was five. New entrants are Hy3 free, GLM 5.2 up 379%, Nemotron 3 Ultra up 302% and Step 3.7 Flash. Claude Sonnet 4.6 exits the top ten.
  • Stack scorecard. Infrastructure standardization moves 3.1 to 3.4 after Moonshot upstreamed KDA prefix caching to vLLM. A footnote on influence over the standard is added, along with a watch item for the next divergent architecture.
  • "A 3.3% average hides a jagged frontier" becomes "A jagged frontier: parity, contested, a closed edge." Rebuilt on concrete evidence from LMArena Frontend Code Arena, Terminal-Bench 2.1 and GDPval-AA v2 rather than category labels. Adds a caveat on vendor-run benchmarks.
  • Inference-cost view condensed to make room for the K3 panel. Sources updated to add Moonshot and MTS/Substack.
Removed
  • "Open source AI in 2026, in four numbers." Summary view dropped, its 3.3-point headline superseded by the AA and ECI framing.
  • "The capability gap: 8.04% to 0.5% to 3.3%." The Chatbot Arena trendline retired along with the Arena-based methodology.
  • Modular removed from the venture-funding chart, at $380M.
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v1.0 14 July 2026 Initial release

The first edition. Five sections covering the capability, cost and adoption evidence, the capital map, the sovereignty argument, the harness thesis, and five bets on the layers above the model.

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Archive

EditionDateSummaryFile
v1.0.1 27 Jul 2026 The K3 patch. New capability-benchmark suite, the deployability line, the distillation claims, and two new release-culture and policy views. Download
v1.0 14 Jul 2026 Initial release. Five sections covering capability and cost evidence, the capital map, sovereignty, the harness thesis and five bets. Download
The State of Open Source AI · v1.0.1 · July 2026 · Last updated July 27, 2026 Back to the report