GPT-5.6 Sol vs Claude Fable 5: A Day of Head-to-Head Testing
A creator spent a full day pitting OpenAI's newest coding model against Anthropic's Fable 5 on real builds, then published the full cost and win-rate numbers.
July 10thOpenAI turns ChatGPT from an answer engine into an agentic coworker — a new Work mode, a desktop app that operates your files and apps, and shareable AI-built websites, all riding on the GPT-5.6 model family.
GPT-5.6 ships alongside ChatGPT Work, a desktop app with computer control, and shareable Sites — reframing ChatGPT from a question-answering chat into an agent meant to finish entire jobs like forecasts, decks, and websites.
OpenAI's GPT-5.6 launch (models Sol, Terra, Luna) is framed less around the model itself and more around three products built on it: ChatGPT Work, a task-completion mode shown running finance variance analysis and forecast updates; a desktop app that reads local files, browser tabs, and other apps, including a visible computer-use cursor that reorganizes a Notes app unsupervised; and Sites, which turns any ChatGPT session into a shareable interactive website, demoed as internal dashboards, a 3D prototype game, and a model-selector mockup built with no Figma file. The research segment claims frontier-eval wins over named competitor models, a parallel-agent 'Ultra Mode,' a fix for GPT-5.5's reward-hacking quirk, and heavy investment in red-teaming and external vulnerability research. It closes with a Japanese farmer's six-month story of using ChatGPT to run his team, whose advice is to start with one small task rather than trying to learn the tool comprehensively first.
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"Live / Starting Soon" countdown graphic over an Earth-sunrise animation before the host begins speaking.

Host announces GPT-5.6 (Sol, Terra, Luna) rolling out over 24 hours, then previews three product updates: ChatGPT Work, a new desktop app, and hosted Sites.

Jessica (engineer) demos the mobile/web Work experience — asking ChatGPT to mine Slack and employee feedback for interesting internal use cases and schedule in-person meetups during a SF trip.

Lauren (strategic finance) runs a variance analysis on a $2M forecast beat, has ChatGPT Work update the Excel forecast model, build a PowerPoint deck, and publish a shareable Sites dashboard, then sends the link over Slack.

Andrew demos the new desktop app: turning a support-ticket spreadsheet into an interactive visualization, synthesizing a folder of PDFs/interviews plus open Chrome tabs into a finished slide deck in ~90 seconds using memory, a quick search widget, and computer-use reorganizing an Apple Notes app live via a visible on-screen cursor.

Ed (designer) shows a site built from connected Slack/Gmail sources, live-edits it into an interactive 3D game by annotating a redesign request, tours internal team dashboards (openai.com team, ChatGPT Images archive), a model-selector prototype, and a fun 3D pelican-riding-a-tricycle test.

Host recaps the product demos and hands off to researchers Katy Shi and Tejal Patwardhan for the model deep dive.

Researchers introduce the three-model family and describe Sol autonomously post-training Luna from a short Codex prompt, plus gains in internal PR volume and experiment velocity.

Benchmark charts (Terminal-Bench, BrowseComp, Agents' Last Exam, DeepSWE 1.1) shown against named competitor models; computer-use deep dive; Ultra Mode parallel-agent chart on SEC-bench Pro.

Disclosure of GPT-5.5's goblin/gremlin reward-hacking quirk and its fix in 5.6, followed by red-teaming compute hours, Project Daybreak, and Patch the Planet.

Live two-way translation demo with Hiroki, a Japanese broccoli farmer, who describes using ChatGPT for six months to run team communication and workflows, and advises starting small.

Host recaps the releases and rollout timing and signs off.
The shift from chatting with AI to delegating real work to it comes down to giving the model access to your files, your apps, and enough runway to work unsupervised for minutes at a time.
“ChatGPT Work is your new partner for ambitious work.”
“Codex made every plot in this livestream and also helped us make the slide deck.”
“GPT 5.6 will only talk about goblins a tasteful amount when it's cute or appropriate.”
“It's really about raising the level of ambition that you have.”
“Starting small and building step by step is really important.”
See every word as it's spoken — crank it to 2× and still catch all of it. The same dual-channel trick behind Amazon's Kindle + Audible.
OpenAI opens by promising three new products in the same breath — a new 'Work' mode, a desktop app that can drive your other apps, and shareable AI-built websites — before the model behind all of it, GPT-5.6, even gets introduced.
The structural spine of the whole livestream — every subsequent demo maps to one of these three named releases.
A three-tier model naming scheme mapped directly to task complexity and budget.
Runs a team of agents in parallel on the same task instead of one agent alone, trading compute for both speed and higher benchmark scores.
“download now — openai.com/chatgpt-work”
Soft, on-screen URL card at close rather than a spoken hard sell; the host recaps rollout timing (Sol to paid plans now, Terra/Luna to free users over 24 hours) instead of pushing a purchase.
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34:55A creator spent a full day pitting OpenAI's newest coding model against Anthropic's Fable 5 on real builds, then published the full cost and win-rate numbers.
July 10thA 13-minute live screen-share of six Codex agent workflows actively generating revenue at Single Grain — running autonomously for days at a time.
June 18thA 22-minute weekly roundup covering the open-source model that finally passed the vibe check, Codex screen-to-skill recording, the SpaceX/Cursor acquisition, and two Claude updates.
June 21stA plain-English field guide to every loop type — heartbeat, cron, hook, and goal — with two live builds in Claude Code and Codex.
June 17thSix weeks, sixty-seven projects, and somewhere between $180,000 and $240,000 in inference spend on early access to a frontier coding model — before the official review even starts.
July 10thA full system for turning lazily-captured voice notes into a self-updating personal wiki — tagged, cross-linked, and rendered as interactive HTML graphs — using a handful of narrow agent skills.
July 7th