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Claude Fable 5 vs Gemini 3.5 Flash

Anthropic · released

Wins 7 of 8 areas

Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents

Google · released

Wins 1 of 8 areas

Following instructions

Claude Fable 5 is the stronger all-rounder.Gemini 3.5 Flash is cheaper and better at following instructions.

Scores updated · 50 tests both models report · How we compare

Where each one wins

Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.

Long documents rests on a single test.

What it costs

Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.

Claude Fable 5$10.00 to read · $50.00 to write$60Price from Artificial Analysis
Gemini 3.5 Flash$1.50 to read · $9.00 to write$11Price from Artificial Analysis

Gemini 3.5 Flash costs 83% less for the same work.

The biggest differences

The three tests each model wins by the widest margin. Scores are out of 100.

Where Claude Fable 5 pulls ahead

  • Extremely hard research-level math problemsFrontierMath Tier 4+63.4points aheadClaude Fable 590.2Gemini 3.5 Flash26.8
  • Complex command-line tasks across many fieldsTerminal-Bench 4.0+35.8points aheadClaude Fable 542.4Gemini 3.5 Flash6.6
  • Long, multi-file coding tasks in real codebasesSWE-bench Pro+24.9points aheadClaude Fable 580Gemini 3.5 Flash55.1

Where Gemini 3.5 Flash pulls ahead

  • Follows unfamiliar, precisely checkable instructionsIFBench+12.8points aheadGemini 3.5 Flash76.3Claude Fable 563.5
  • Long professional tasks in banking, consulting and lawAA ApexAgents+3.8points aheadGemini 3.5 Flash47.1Claude Fable 543.3
  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+1.4points aheadGemini 3.5 Flash37.8Claude Fable 536.4

Every test, side by side

All 50 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingClaude Fable 5

Full coding ranking

AgentsClaude Fable 5

Full agents ranking

ReasoningClaude Fable 5

Full reasoning ranking

FactsClaude Fable 5

Full facts ranking

Images and chartsClaude Fable 5

Full images and charts ranking

MathClaude Fable 5

Full math ranking

Long documentsClaude Fable 5
  • AA-LCRClaude Fable 5 by 982.373.3+9

Full long documents ranking

Following instructionsGemini 3.5 Flash

Full following instructions ranking

Other results20 tests, not counted

Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.

Questions people ask

Which is better, Claude Fable 5 or Gemini 3.5 Flash?

Claude Fable 5 wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and long documents. Gemini 3.5 Flash wins following instructions, and costs 83% less.

Which is better for coding?

Claude Fable 5. It wins 7 of the 7 coding tests both models report; Gemini 3.5 Flash wins none.

Which is cheaper?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Gemini 3.5 Flash costs $1.50 and $9.00. That makes Gemini 3.5 Flash about 83% cheaper for the same work.

How do you compare the two?

We use the 50 benchmark tests both models have published scores on. The verdict counts the 30 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 20 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.

Compare Claude Fable 5 with

Anthropic

Across the field

Compare Gemini 3.5 Flash with

Google

Across the field

All comparisons