| Value | Source | As of | Reported by | Notes |
|---|---|---|---|---|
| 61 index | artificial-analysis-intelligence-index ↗ | 2026-08-31 | aggregatorA | GPT-5.6 Sol (max), ranked #5 — first index entry for this entity; answers the open hard-problems flag's request for a GPT-5.6 reading. Index v4.1.1. |
OpenAI announced Daybreak Red, which brings GPT-5.6 Cyber to approved customers, is now available in AWS GovCloud (US-East) through Amazon Bedrock for authorized cybersecurity work.
Security researchers at Calif, working with OpenAI's "Patch the Planet" program using GPT-5.6 Sol, and separately at Wiz (part of Google Cloud, using Gemini 4 Argon, GPT-5.6 Sol, and Wiz's own Wiz Atlas tool), independently discovered two memory-corruption vulnerabilities in the core PHP engine (CVE-2026-109618, CVE-2026-109619), with demonstrated pre-authentication remote code execution against WordPress, Drupal, and Joomla. Wiz found the first flaw around August 19, 2026 and reported it to the PHP security team August 24; the PHP project spent roughly two months on a coordinated fix. The planned October 22 disclosure was moved up to October 21 after the CVE IDs (with an incorrect CVSS score of 10.0; the actual score is 9.2) leaked onto social media and a proof-of-concept video from Calif was briefly published and copied before deletion. Cloudflare's CTO reported exploitation attempts rising from thousands in the 10 hours before public disclosure to millions within hours of the patch release, against infrastructure running PHP, which powers an estimated 70% of the web.
About an hour after Anthropic's Opus 5.5 launch, OpenAI released GPT-6 Sol and GPT-6 Luna, which it says are 'cut from the same cloth' as GPT-6 Astra. Per pricing reported by Simon Willison, GPT-6 Luna is priced at $0.10/$0.50 per million input/output tokens (half of GPT-5.6 Luna's $0.20/$1.20), and GPT-6 Sol is $2/$10 (half of GPT-5.6 Sol's $4/$20). OpenAI also shipped improved prompt caching for GPT-6, including higher cache-hit rates, new diagnostics, and explicit breakpoints. TechCrunch reports OpenAI says the new models make 'fewer mistakes.'
OpenAI published a customer case study describing how V7 uses GPT-5.6 to turn scattered company files into context that AI agents can use to complete complex, source-linked work.
On September 1, 2026, Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, positioned for long-running agentic coding, knowledge work, and research, both with a 1M-token context window, 128k max output tokens, and always-on adaptive thinking. List pricing stays at $10/$50 per MTok input/output (same as Fable 5), but prompt cache read price drops 75% to $0.25/MTok. Anthropic also introduced Enterprise Frontier Safeguards (EFS) for agent observability. Per Stratechery, Fable's prior data retention policy was removed rather than merely altered. Anthropic's own benchmark table reports Fable 5.1 scoring 52.6% on the new Terminal-Bench-Science 0.1 benchmark versus 24.7% for Fable 5, 29.0% for Opus 5, and 22.4% for GPT-5.6 Sol. TechCrunch reported the release also reduces false-positive safeguard restrictions. Per Latent Space's AINews recap, Artificial Analysis measured roughly 1.7x more output tokens per task, offsetting the cache savings for a reported ~20% net per-task cost increase.