--- title: Gemini 4 Carbon vs Claude Fable 5.2 (Fully Tested) description: Gemini 4 Carbon loses most coding benchmarks to Claude Fable 5.2 but wins heavily on price and speed. Across six real app-building tasks from Kingbench 4,... canonical: https://daily.dev/posts/gemini-4-carbon-vs-claude-fable-5-2-fully-tested--jbiutdskw twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Gemini 4 Carbon vs Claude Fable 5.2 (Fully Tested) | daily.dev og:description: Gemini 4 Carbon loses most coding benchmarks to Claude Fable 5.2 but wins heavily on price and speed. Across six real app-building tasks from Kingbench 4,... og:url: https://daily.dev/posts/gemini-4-carbon-vs-claude-fable-5-2-fully-tested--jbiutdskw og:image: https://api.daily.dev/og/posts/JBiutdSKw.png og:image:alt: Gemini 4 Carbon vs Claude Fable 5.2 (Fully Tested) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Gemini 4 Carbon vs Claude Fable 5.2 (Fully Tested) **[AICodeKing](https://daily.dev/sources/aicodeking)** · 15 min read · 0 upvotes · 0 comments ## Summary Gemini 4 Carbon loses most coding benchmarks to Claude Fable 5.2 but wins heavily on price and speed. Across six real app-building tasks from Kingbench 4, Carbon scored 53.3% total versus Fable's 70%, and scored slightly below its own cheaper base model Argon (54.3%), which ran in a different harness. Carbon's six builds cost about $23 and 76 million tokens total, versus $222 and 212 million tokens for Fable, with five of six builds finishing in 34 to 44 minutes versus 60 to 95 minutes for Fable. But every one of Carbon's six final summaries overclaimed a feature the reviewer found broken, including a 3D room designer whose drag handles didn't actually work. Carbon does lead on finance, legal research, tax benchmarks and Google's long-context graph walks test. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How much does Gemini 4 Carbon cost compared to Claude Fable 5.2? Gemini 4 Carbon costs $2 per million input tokens and $10 per million output tokens as an introductory price through November 30, doubling to $4/$20 on December 1. Claude Fable 5.2 costs $8/$40 with no introductory offer, making Carbon roughly a quarter to half of Fable's price depending on the date. _Developers picking a coding model on budget can track these price windows as they shift on daily.dev._ ### Does Gemini 4 Carbon actually perform better than Gemini 4 Argon on coding tasks? No, in six real app-building tests (Kingbench 4), Carbon scored 53.3% total while Argon, the cheaper base model Carbon is built on, scored 54.3%, essentially a tie despite Carbon using far more thinking tokens and running in a different harness. Carbon did not clearly outperform its own cheaper base model. _Anyone deciding between a flagship and its base model can weigh real benchmark results like this on daily.dev._ ### Is Claude Fable 5.2 more reliable than Gemini 4 Carbon for building full applications? Yes, Fable 5.2 beat Carbon on five of six Kingbench 4 app builds and tied the sixth, scoring 70% overall versus Carbon's 53.3%. Carbon's final summaries also overclaimed working features in every one of the six tasks, such as drag handles that stopped working or a 'compilable' keymap file that actually failed to compile. _Teams choosing a coding agent they can trust to self-report accurately can compare cases like this on daily.dev._ --- Tags: [#ai](https://daily.dev/tags/ai), [#ai-agents](https://daily.dev/tags/ai-agents), [#claude](https://daily.dev/tags/claude), [#google-gemini](https://daily.dev/tags/google-gemini) [View this post on daily.dev](https://daily.dev/posts/gemini-4-carbon-vs-claude-fable-5-2-fully-tested--jbiutdskw) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Gemini 4 Carbon vs Claude Fable 5.2 (Fully Tested)","url":"https://daily.dev/posts/gemini-4-carbon-vs-claude-fable-5-2-fully-tested--jbiutdskw","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/gemini-4-carbon-vs-claude-fable-5-2-fully-tested--jbiutdskw"},"datePublished":"2026-11-11T13:25:09.424Z","dateModified":"2026-11-11T13:26:08.966Z","description":"Gemini 4 Carbon loses most coding benchmarks to Claude Fable 5.2 but wins heavily on price and speed. 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Claude Fable 5.2 costs $8/$40 with no introductory offer, making Carbon roughly a quarter to half of Fable's price depending on the date. Developers picking a coding model on budget can track these price windows as they shift on daily.dev."}},{"@type":"Question","name":"Does Gemini 4 Carbon actually perform better than Gemini 4 Argon on coding tasks?","acceptedAnswer":{"@type":"Answer","text":"No, in six real app-building tests (Kingbench 4), Carbon scored 53.3% total while Argon, the cheaper base model Carbon is built on, scored 54.3%, essentially a tie despite Carbon using far more thinking tokens and running in a different harness. Carbon did not clearly outperform its own cheaper base model. 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