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Claude Fable 5.1
Released Sept 1, 2026. Leads Intelligence Index (66) and Coding Agent Index (70.4). Best for long-horizon coding with 75% cheaper cache reads.
$10/$50 per M · cache $0.25 · ~67 tps
- Long-Horizon Agentic Coding
- Monorepo Refactors
GPT-6 Astra
Released Sept 3, 2026. First "Critical" cyber-capability model. Leads FrontierMath (97.6%), ARC-AGI-3 (99.9%), OSWorld computer use.
$10/$50 per M · cache $1 · ~52 tps
- End-to-End Computer/Browser Work
- Hard Math & Spatial Builds
Gemini 3.8 Flash
Released Sept 2, 2026. 13x cheaper ($0.75/$3.75) at 85%+ flagship quality. 302 tps for bulk pipelines; weak at terminal coding (19.1%).
$0.75/$3.75 per M · cache $0.075 · ~305 tps
- High-Volume Batch Processing
- RAG Q&A & Labeling
Gemini 3.8 Live
Released Sept 15, 2026. Live dialogue with 97-language switching, visual grounding, background tool calls while chatting.
$0.75/$3.75 per M · cache $0.075
- Voice Agents & Contact Centers
- Realtime Multilingual Dialogue
Antigravity Agent
Powerful pair programming agentic system built for autonomous codebase reasoning, task execution, and subagent orchestration.
- Multi-file Code Base Modifications
- Autonomous Build Verification
Thermos
Official Cursor plugin for thermo-nuclear branch review: parallel correctness/security and code-quality audits. Browse SKILL.md files in KingPrompt or install with /add-plugin thermos.
- Branch security audits
- Harsh maintainability reviews
Agent Compatibility
Official Cursor plugin for repo compatibility scans: startup, validation loop, and docs vs reality. Browse SKILL.md files in KingPrompt or install with /add-plugin agent-compatibility.
- Repo agent-readiness audits
- Startup and validation loops
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