GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark

2026-07-09 · 37 min · 20 entities

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→ hosted by Claire Vo person

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Feed author/publisher: Claire Vo
→ discusses Technology company

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Feed category: Technology
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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://penname.co/
→ references Codex website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://openai.com/codex
→ references chatprd.ai website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://chatprd.ai/
→ references clairevo.com website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://clairevo.com/
→ references capcut.com website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://capcut.com/
→ references mathacademy.com website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://mathacademy.com/
→ references A Preview Of Gpt 56 Sol Terra And Luna website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://help.openai.com/en/articles/20001325-a-preview-of-gpt-56-sol-terra-and-luna

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mentioned penname.co website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://penname.co/
mentioned Codex website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://openai.com/codex
mentioned chatprd.ai website

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evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://chatprd.ai/
mentioned clairevo.com website

0.45

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://clairevo.com/
mentioned capcut.com website

0.45

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://capcut.com/
mentioned mathacademy.com website

0.45

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://mathacademy.com/
mentioned A Preview Of Gpt 56 Sol Terra And Luna website

0.45

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://help.openai.com/en/articles/20001325-a-preview-of-gpt-56-sol-terra-and-luna
references penname.co website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://penname.co/
references Codex website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://openai.com/codex
references chatprd.ai website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://chatprd.ai/
references clairevo.com website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://clairevo.com/
references capcut.com website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://capcut.com/
references mathacademy.com website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://mathacademy.com/
references A Preview Of Gpt 56 Sol Terra And Luna website

0.38

evidence rules-v5
Link in episode "GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark": https://help.openai.com/en/articles/20001325-a-preview-of-gpt-56-sol-terra-and-luna

persons 2

mentioned Claire Vo person

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evidence rules-v5
Feed author/publisher: Claire Vo
hosted by Claire Vo person

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evidence rules-v5
Feed author/publisher: Claire Vo

companys 2

mentioned Technology company

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evidence rules-v5
Feed category: Technology
discusses Technology company

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evidence rules-v5
Feed category: Technology

concepts 2

mentioned Why OpenAI’s new model crushes my benchmark concept

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GPT-5.6 Sol vs. Claude Fable: Why OpenAI’s new model crushes my benchmark
mentioned GPT concept

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GPT

Episode description as stored

GPT-5.6 Sol is back, and I ran it through my full How I AI vibe benchmark against GPT-5.6 Terra, Luna, Claude Fable 5, and Sonnet 5 across five categories: PRDs, prototypes, wireframes, debugging, and agentic voice. Sol won by a meaningful margin on my Claire Weighted Index (70% my taste, 30% Terminal Bench 2.1), and I also tested two use cases I can't stop thinking about: building a gamified homework tracking app for my kids in one shot with Codex, and browser automation with Chrome that burned through 500 LinkedIn replies while I did literally nothing. What you’ll learn: How I scored five AI models (including GPT 5.6 Sol, Fable 5, and Sonnet 5) using my “Claire Weighted Index” benchmark across PRDs, prototypes, code, and agentic voice The difference between GPT-5.6 Sol (Terra) and Sol for PRD writing How Fable’s precision and pedantry made it harder to collaborate with, and the exact moment Sol broke through where Fable got stuck Why Sonnet 5 is still my go-to for agentic voice in OpenClaw, even after this whole benchmark How I used GPT-5.6 Sol in Codex to build a fully gamified homework tracking app for my kids in one shot The video editing use case that saved me hours clipping a talk I gave at Cursor’s event How to use Codex plus GPT-5.6 and Chrome for browser automation, and why this is my single most-loved use case right now — In this episode, I cover: (00:00) Intro (01:10) The three GPT-5.6 models: Sol, Terra, Luna (02:17) Pricing: Sol vs. Fable API costs (03:24) The How I AI benchmark (05:03) Claire-weighted Index results (07:00) Per-task winners: prototypes, PRDs, agentic voice (11:59) What Claire actually rewards (13:20) Full-fidelity prototype side-by-sides (Sol vs. Fable) (17:45) Wireframes (18:19) Agentic voice (19:15) Where Sol is better than other models (23:56) Gamified kids’ homework app, built in one shot (28:02) Fable’s pedantry problem and how Sol broke through it (31:49) Two bonus use cases: video editing and browser use (35:08) Final summary and model recommendations — Tools referenced: • GPT 5.6 (Sol, Terra, Luna): https://help.openai.com/en/articles/20001325-a-preview-of-gpt-56-sol-terra-and-luna • Codex: https://openai.com/codex • ChatPRD: https://www.chatprd.ai/ • CapCut: https://www.capcut.com/ • Math Academy: https://www.mathacademy.com/ — Other references: • Cursor event where Claire spoke on the future of PM: https://www.youtube.com/watch?v=4CAFK-rc26A • ChatPRD blog (where benchmark outputs will be published): https://www.chatprd.ai/ — Where to find Claire Vo: ChatPRD: https://www.chatprd.ai/ Website: https://clairevo.com/ LinkedIn: https://www.linkedin.com/in/clairevo/ X: https://x.com/clairevo — Production and marketing by https://penname.co/ . For inquiries about sponsoring the podcast, email jordan@penname.co.