GPT-6, Grok 5, DeepSeek V4 Pro: The August Roadmap

The August 2026 model calendar is a study in asymmetric pressure: OpenAI’s next flagship is reportedly sprinting toward an unseen launch, xAI’s Grok 5 keeps missing every publicly stated window, and DeepSeek — already shipping V4 at rock-bottom prices — just introduced a pricing structure nobody in the API market had tried.

Key facts

• GPT-6 (or GPT-5.7): leaks point to an August release with a 1.5M+ token context window, a brand-new pretraining foundation beyond GPT-5.5’s, and reports of up to 10T-scale training — plus the strongest agentic-reasoning push yet.
• Grok 5: still unreleased. Announced at ~6T parameters on Colossus 2, it slipped from Q1, missed Q2 (GPT-5.5 “Spud” shipped April 23; Claude Mythos previewed in April), and has no confirmed date in August.
• DeepSeek V4 Pro: official GA in mid-July — 1.6T parameters, 49B active, 1M native context, open-source — and the first public LLM API to adopt peak-hour pricing: 2× token rates during 9:00–12:00 and 14:00–18:00 Beijing time.
• The market frame: for the first time, four frontier release campaigns (GPT-6, Grok 5, Claude Mythos, Gemini 3.2) are interlocking instead of staggering.

Why it matters

• Context is the new raw material. A 1.5M-token flagship changes what agents can do in one pass — whole codebases, entire corporate knowledge bases, complete legal files.
• Delay is a strategy signal. Grok 5’s slippage while its competitors ship shifts real developer mindshare; the pre-IPO roadshow calendar multiplies the stakes.
• DeepSeek’s peak pricing is the real innovation. It inverts cloud economics — penalize the congested window instead of discounting the idle one. For agents running around the clock, it’s a 29% bill uplift on average; for daytime-realtime apps, ~2×. It is how a model company starts acting like a utility.

What to watch

• Whether GPT-6 actually ships in August or the leak becomes another mid-cycle miss.
• Grok 5’s final release slot — and whether xAI’s 6T claim survives contact with shipping.
• Copycats on peak pricing: if DeepSeek’s meter survives contact with developers, expect Mirrors at cloud providers within quarters.

Official source

• WinCentral: GPT-5.7/GPT-6 leak: August launch, 1.5M token context
• Digital Applied: DeepSeek V4, GPT-5.5, Grok 5 — Q2 2026 preview
• FelloAI: Grok 5 — all we know so far (August 2026)

Updated August 10, 2026. Leak-based details remain unconfirmed until official announcements.