ARC-AGI-3

GPT-6 Astra Shows Strong Tool Use and Math Results but Trails in Text Quality Tests

OpenAI released GPT-6 Astra on 3 September 2026 with capabilities for long-horizon tasks involving code, documents and external tools. Independent benchmarks from Artificial Analysis, Epoch AI and others reveal a mixed picture: the model leads in Epoch Capabilities Index and certain coding agent tests yet falls behind Claude Fable 5.1 in text generation and some professional document tasks. Astra solved two previously open problems on FrontierMath Erdős and reached 99.9 percent on ARC-AGI-3 when paired with a state-preserving adapter. The model was rated Critical for cyber capabilities after scoring 100 percent on ExploitBench and discovering two previously unknown vulnerabilities. Pricing starts at $10 per million input tokens, 2.5 times higher than GPT-5.6 Sol, while real-world costs vary sharply depending on task length and retries.

OpenAI Unveils GPT-6 Astra: First Model Rated Critical for Cybersecurity with Record Computer-Use Performance

OpenAI has released GPT-6 Astra, positioning it as a major advance in agentic AI capable of directly operating computer interfaces through mouse, keyboard, and screen interaction. The model achieved 72.6% on the OSWorld 2.0 benchmark, nearly doubling speed compared with GPT-5.6 Sol while delivering higher quality results. On ARC-AGI-3 it scored 62.7% in standard mode and 99.9% with provider-adapted harness, prompting debate over benchmark methodology. Most notably, OpenAI assigned Astra a Critical rating under its Preparedness Framework, the first for any company model, after it autonomously discovered two previously unknown zero-day vulnerabilities in the V8 engine and chained exploits to escape sandboxes. The public version blocks advanced offensive requests, while vetted organizations gain access through the Daybreak Blue program. Independent evaluations show mixed general-intelligence gains but clear improvements in action-oriented tasks and reduced hallucination rates.

Claude Opus 5 Tops Artificial Analysis Index While Maintaining Strict Cybersecurity Safeguards

Anthropic has released Claude Opus 5, positioning it as a more accessible and cost-effective alternative to its restricted Fable 5 model. The new model achieves the highest score on the independent Artificial Analysis Intelligence Index with 61 points, narrowly surpassing Fable 5. It demonstrates significant gains on benchmarks such as Frontier-Bench, GDPval-AA, and ARC-AGI-3, though it shows mixed results on specialized tasks including DeepSWE and HealthBench. Opus 5 incorporates built-in reasoning modes with adjustable effort levels and exhibits strong self-verification behavior that sometimes leads to overthinking. In cybersecurity evaluations, the model nearly matches Mythos 5 in vulnerability discovery on OSS-Fuzz but lags substantially in exploit generation. Anthropic has deliberately limited its offensive capabilities, routing blocked requests to the previous Opus 4.8 model.