[::] Agentic Stacks

Claude Fable 5 vs Gemini 3.5 Flash

Pick two tools from the same category to compare side-by-side.

Claude Fable 5
Anthropic's most capable widely released model, built for demanding reasoning and long-horizon agentic work.
 Gemini 3.5 Flash
Google's stable frontier model for sustained agentic and coding work, the current GA workhorse of the Gemini 3 family.
Category modelmodel
Vendor type commercialcommercial
Pricing usageusage
Strengths
  • + Vendor-stated state-of-the-art on nearly all tested benchmarks, with the lead growing on longer, more complex tasks
  • + 1M-token context window and up to 128k output tokens per request
  • + Built for long-horizon autonomous agent work with memory tool, compaction, and programmatic tool calling
  • + Server-side fallback parameter and fallback credit simplify refusal handling
  • + Only stable GA model in the Gemini 3.x family as of June 2026; positioned for agentic execution and sub-agent deployment
  • + 1M-token context window with thought preservation across multi-turn agent loops
  • + Rich built-in tool ecosystem (search/maps grounding, code execution, file search, function calling)
Tradeoffs
  • − Premium pricing: $10 per million input tokens and $50 per million output tokens
  • − Safety classifiers can refuse requests (vendor says under 5% of sessions on average, sometimes catching harmless ones), so integrations must handle stop_reason refusal
  • − 30-day data retention required; not available under zero data retention
  • − Per Google docs: Computer Use is not supported at this moment (it was available in the Gemini 3 Flash Preview)
  • − Output capped at 65k tokens, lower than competing flagships' 128k
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