Claude Fable 5.1
Provider status: active; identity checked 2026-10-08. Documented support: Work with long documents; Call tools and functions; Understand images.
$10 input / $50 output per million tokens
All starting points
Atlas / Find your approach
Answer customer questions.
Test useful, grounded answers before connecting an assistant to customers.
Your situation
What does a useful result look like?
Choose a priority above, or start with these questions.
Open questions will travel with your prompt. Nothing is assumed on your behalf.
The practical differences
Two ways into this work.
Keep the wider workflow in view as you decide.
Access & limits
Gemini NotebookSource notebook
The Gemini Notebook mobile app may have limitations to chat features; Live Voice Chat is currently available only to users ages 18+ on the mobile app.
ClaudeAI assistant app
Chat uploads allow up to 20 files per chat, 500MB per file, up to 8000x8000 pixels for images, and PDFs up to 1000 pages. Project files are limited to 30MB per file with unlimited file count, but total content must fit within Claude's context window and supports text extraction only (except multimodal PDFs).
Working with your files
Gemini NotebookSource notebook
You can upload sources and ask the model questions, give instructions, or select which sources the model should use. Agentic capabilities allow searching the web, running code, and creating downloadable files, charts, and images with or without sources.
ClaudeAI assistant app
Files can be uploaded to individual chats or to a project's Files section for persistent reference across conversations. Supported document types include PDF, DOCX, CSV, TXT, HTML, ODT, RTF, EPUB, JSON, and XLSX (XLSX requires code execution and file creation enabled). Supported image formats are JPEG, PNG, GIF, and WebP.
Checking an answer
Gemini NotebookSource notebook
Gemini Notebook uses direct quotes, text, and images from your sources as citations to help check response accuracy. Hovering over a citation shows the full quoted text; selecting it navigates to the quote in context.
ClaudeAI assistant app
Claude analyzes both text and visual elements (images, charts, graphics) in PDFs of 100 pages or fewer. For PDFs from 101 to 1000 pages, Claude processes text only and does not analyze visual elements. For non-PDF documents, Claude extracts text only and cannot read embedded images.
Latest source check: 2026-10-15. These are product offerings, not individual model benchmarks. Plans and availability can change.
Models to evaluate now
Candidates reflect current provider identities and documented capability coverage. A newer release is not evidence of better output quality.
Model and API access can differ from the models available in your chosen app.
Claude Opus 5.5
Provider status: active; identity checked 2026-10-08. Documented support: Work with long documents; Call tools and functions; Understand images.
$4 input / $20 output per million tokens
Claude Sonnet 5.5
Provider status: active; identity checked 2026-10-08. Documented support: Work with long documents; Call tools and functions; Understand images.
$2 input / $10 output per million tokens
What changed in the research
- Gemini Notebook: Verified changes to verified.sources, verified.citations, verified.images, facts.Access & limits, facts.Working with your files, facts.Checking an answer. Recommendations and exported plans use this evidence. 2026-10-15
- Claude tasks: Verified changes to verified.plainLanguage, facts.How you direct it, facts.What you connect, facts.What you own. Recommendations and exported plans use this evidence. 2026-10-15
- Lovable: Verified changes to verified.codeWorkspace, facts.From idea to preview, facts.Keeping control, facts.Ongoing cost. Recommendations and exported plans use this evidence. 2026-10-15
- Replit: Verified changes to verified.browserBuild, verified.codeWorkspace, facts.From idea to preview, facts.Keeping control, facts.Ongoing cost. Recommendations and exported plans use this evidence. 2026-10-15
- Lovable: Verified changes to verified.browserBuild, verified.codeWorkspace, verified.portable, facts.From idea to preview, facts.Keeping control, facts.Ongoing cost. Recommendations and exported plans use this evidence. 2026-10-15
- GPT-6 Sol: Verified changes to priceTokenIn, priceTokenOut, api, caps.long context, caps.tool use, caps.vision input, caps.extended thinking. Recommendations and exported plans use this evidence. 2026-10-14
When the next step gets complicated
We’ll help clear the way.
Take the prompt and keep building. If you hit a roadblock, we can help with the architecture, integrations, or an AI-built app that needs experienced hands.