Entity trail

GPT-5.6 Sol Ultrafast

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

Briefing refs

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Corpus findings

2026-08-14 / reddit-researcherFour Frontier Releases in About 72 Hours: r/singularity's 'No Way, What an AI Week' Hits 496 UpvotesA meta-post cataloguing the week's release density topped r/singularity at 496 upvotes and 60 comments — Grok 4.6 (Aug 12), DeepSeek V4-Pro and Harness (Aug 13), GPT-5.6 Sol Ultrafast (Aug 13), and GLM-5.3 (Aug 14) all landed inside roughly 72 hours. This follows r/LocalLLaMA declaring a "Models Day" the previous day, making it two consecutive multi-release clusters. The practical consequence for builders is that benchmark comparisons published more than a week ago are now stale in three separate model families at once.
2026-08-14 / reddit-researcherCerebras Clocks Humanity's Last Exam at 11 Hours 11 Minutes for 2,500 Questions — Against 78+ Hours for Claude Fable 5The most concrete number in the Cerebras/OpenAI Ultrafast writeup is a wall-clock eval comparison: GPT-5.6 Sol Ultrafast completed all 2,500 Humanity's Last Exam questions in 11 hours 11 minutes, versus 78+ hours for Claude Fable 5, and posted a 5.6x end-to-end speedup on GDP-Val with no measured degradation. Cerebras claims the throughput comes "without any quality compromise," with accuracy comparable to the slower serving path. For anyone running long agentic eval sweeps, this reframes inference speed as an experiment-iteration variable rather than a UX nicety.
2026-08-14 / reddit-researcherOpenAI Previews 'Ultrafast' Tier: GPT-5.6 Sol at 750 Output Tokens/Sec on Cerebras Wafer-Scale Silicon, 14x Standard SpeedOn August 13 OpenAI and Cerebras announced Ultrafast, a new API service tier running GPT-5.6 Sol at up to 750 output tokens per second — up to 14x Standard processing, 11x faster than Claude Fable 5, and 5x faster than Opus 4.8 on Fast mode. It runs on the Cerebras Wafer-Scale Engine with 44 GB of on-chip SRAM per wafer, launching as a limited API preview for select customers with capacity-gated expansion. OpenAI is targeting latency-bound products — financial research, incident response, support, voice, commerce, live experimentation — where a frontier model previously had to sit behind a batch job.

Graph relationships

BENCHMARKED AGAINST
Claude Fable 5
GPT-5.6 Sol Ultrafast completed Humanity's Last Exam in 11 hours vs 78+ hours for Claude Fable 5.
Source finding
RELEASED
OpenAI
OpenAI released GPT-5.6 Sol Ultrafast with Cerebras partnership.
Source finding
COMPETES WITH
Claude Fable 5
Four frontier models released within 72 hours, including GPT-5.6 Sol Ultrafast and Claude Fable 5.
Source finding
COMPETES WITH
Grok 4.6
Grok 4.6 released alongside GPT-5.6 Sol Ultrafast in a rapid release cycle.
Source finding
RELEASED
OpenAI -> GPT-5.6 Sol Ultrafast
OpenAI released GPT-5.6 Sol Ultrafast with Cerebras partnership.
Source finding
COMPETES WITH
Grok 4.6 -> GPT-5.6 Sol Ultrafast
Grok 4.6 released alongside GPT-5.6 Sol Ultrafast in a rapid release cycle.
Source finding

Source trail

r/singularity (496up/60c) — community aggregation of individually verified releases Cerebras Blog (corroborated by unite.ai and 9to5Mac)OpenAI (corroborated by Cerebras blog, TechCrunch, GlobeNewswire); r/singularity 463up/43c

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