GPT-5.6 Leaked: 1.5M Context Window + Claude Mythos Sweeps 17 of 18 Benchmarks

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Three coordinated leaks reshuffled the frontier-model race in 48 hours.  • GPT-5.6 identifier spotted in OpenAI Codex backend traces — codenames iris-alpha, ember-alpha, beacon-alpha • 1.5M token context window (+43% over GPT-5.5) • Polymarket 85%+ odds of release before June 30 • Claude Mythos benchmark scorecard leaked — Mythos wins 17 of 18 • SWE-bench Verified: 93.9% (vs Opus 4.6 at 80.8%) • Mozilla reportedly found 231 zero-days testing Mythos against Firefox • Microsoft Build 2026 slide briefly revealed Mythos training compute at ~6.1 × 10²⁷ FLOPs (~300x GPT-4)  This is a leak roundup, not a confirmed announcement. Treat specific numbers as directional until OpenAI exposes a gpt-5.6 SKU or Anthropic publishes a Mythos model card.  Full benchmark table (free PDF) and channel: https://www.youtube.com/@gptaiclips Source short: https://www.youtube.com/shorts/c8-5nYWz-OE

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00:06GPT 5.6 just leaked and the receipts are everywhere. Multiple devs spotted a model

00:12called GPT 5.6 in OpenAI's codex backend logs. Internal codenames are floating around.

00:18Iris Alpha, Ember Alpha, and Beacon Alpha. That's three checkpoints being A-B tested

00:22at once. Here's the kicker. 1.5 million token context window. GPT 5.5 capped at 1.05 million.

00:29That's a 43% jump in one release. Polymarket has GPT 5.6 dropping before June 30th at over 85

00:36%

00:36probability. Insiders say it'll match Claude Mythos at 2 to 3 times cheaper. And about Mythos,

00:42Anthropix Secret Monster leads 17 of 18 benchmarks. 93.9% SWE Bench Verified. 97.6% on the USA

00:50Math

00:51Olympiad. Saturated SciBench at 100%. Mozilla turned Mythos loose on Firefox. It found 231

00:57zero-day vulnerabilities. 10 times more than the previous Claude model. Microsoft accidentally

01:02leaked the training compute on a slide. 6.1 times 10 to the 27 flops. That's trillions of parameters.

01:09Subscribe to GPT AI Clips. The free guide drops the full benchmark table and release dates in the

01:14description.

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