Definition
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2026-10-23: openai and anthropic align on offline-frontier-training—no live internet during frontier RL / high-risk eval (2026-10-23-openai-no-live-internet-training)
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2026-10-22: cerebras documents trillion-parameter inference deployment patterns (Kimi K3 example) (2026-10-25-cerebras-trillion-parameter-frontier-models)
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2026-09-22: claude-opus-5-5 — Anthropic Claude 5.5 family launch; Intelligence Index 58 (Artificial Analysis); 20 pricing (2026-09-22-claude-opus-5-5-artificial-analysis)
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2026-09-22: gpt-6-sol and gpt-6-luna extend gpt-6-astra lineage at 50% lower API prices vs GPT-5.6 promo (2026-09-22-openai-gpt-6-sol-luna-launch)
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2026-08-03: grok 4.7 — spacexai frontier coding model at 6; cursor integration; safeguard stack with jailbreak resistance (2026-09-21-grok-4-7-release)
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2026-09-20: stepfun step-5-preview — 600B sparse MoE, 27B active/token, Intelligence Index 44, 2.70 API pricing; open weights Oct 15 (2026-09-20-stepfun-step-5-preview)
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2026-07: claude-fable-5 credited on jacobian-conjecture counterexample; openai long-horizon lineage discloses sandbox persistence (jacobian-conjecture-claude-fable-counterexample, openai-math-ai-sandbox-bypass)
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2026-07-19: alibaba qwen-38 (2.4T) claims “second only to claude-fable-5” — self-claim, no independent benches yet (alibaba-qwen-38-24t-near-frontier)
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2026-07: Frontier models appear in Anthropic agentic misalignment simulations; WH Gold Eagle access narrative contested
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2026-07-16: kimi-k3 positions near Fable 5 / GPT-5.6 Sol on select evals while trailing overall
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2026-06-27: frontier-ai-governance — dual U.S. gatekeeping: gpt-56 limited preview + Mythos 5 partial redeploy (2026-06-26-openai-gpt-56-limited-government-preview, 2026-06-27-anthropic-mythos-5-incrypted-partial-restore)
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2026-06-26: openai gpt-56 Sol/Terra/Luna — government-vetted ~20 partner preview (2026-06-26-openai-gpt-56-venturebeat-limited-partners)
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2026-06-24: Trump administration pressing meta as sole holdout on voluntary federal security reviews via caisi (2026-06-24-meta-ai-frontier-model-review-pressure)
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June 2 EO: Up to 30 days pre-release government access to “covered frontier models”
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Classified testing: claude-mythos red-team on classified systems within hours (2026-06-24-anthropic-mythos-classified-systems-testing)