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Claude Opus 4.8 vs Gemini 3.5 Flash

Anthropic · released

Wins 5 of 8 areas

Coding · Agents · Reasoning · Math · Long documents

Google · released

Wins 2 of 8 areas

Facts · Following instructions

Claude Opus 4.8 is the stronger all-rounder.Gemini 3.5 Flash is cheaper and better at following instructions.

Scores updated · 56 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 Opus 4.8$5.00 to read · $25.00 to write$30Price from Artificial Analysis
Gemini 3.5 Flash$1.50 to read · $9.00 to write$11Price from Artificial Analysis

Gemini 3.5 Flash costs 65% 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 Opus 4.8 pulls ahead

  • Extremely hard research-level math problemsFrontierMath Tier 4+29.3points aheadClaude Opus 4.856.1Gemini 3.5 Flash26.8
  • Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+22.9points aheadClaude Opus 4.860.7Gemini 3.5 Flash37.8
  • Hard command-line tasks in a real terminalTerminal-Bench Hard+17.4points aheadClaude Opus 4.858.3Gemini 3.5 Flash40.9

Where Gemini 3.5 Flash pulls ahead

  • Follows unfamiliar, precisely checkable instructionsIFBench+14.1points aheadGemini 3.5 Flash76.3Claude Opus 4.862.2
  • Short factual questions, answered correctlySimpleQA Verified+13.2points aheadGemini 3.5 Flash66.2Claude Opus 4.853
  • Common-sense trick questionsSimpleBench+11.9points aheadGemini 3.5 Flash76.7Claude Opus 4.864.8

Every test, side by side

All 56 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingClaude Opus 4.8

Full coding ranking

AgentsClaude Opus 4.8

Full agents ranking

ReasoningClaude Opus 4.8

Full reasoning ranking

FactsGemini 3.5 Flash

Full facts ranking

Images and chartsEven

Full images and charts ranking

MathClaude Opus 4.8

Full math ranking

Long documentsClaude Opus 4.8
  • AA-LCRClaude Opus 4.8 by 4.477.773.3+4.4

Full long documents ranking

Following instructionsGemini 3.5 Flash

Full following instructions ranking

Other results24 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 Opus 4.8 or Gemini 3.5 Flash?

Claude Opus 4.8 wins five of the eight areas we test: coding, agents, reasoning, math and long documents. Gemini 3.5 Flash wins facts and following instructions, and costs 65% less. They are level on images and charts.

Which is better for coding?

Claude Opus 4.8. It wins 6 of the 7 coding tests both models report; Gemini 3.5 Flash wins none, and 1 is a tie.

Which is cheaper?

Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.5 Flash costs $1.50 and $9.00. That makes Gemini 3.5 Flash about 65% cheaper for the same work.

How do you compare the two?

We use the 56 benchmark tests both models have published scores on. The verdict counts the 32 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 24 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 Opus 4.8 with

Anthropic

Across the field

Compare Gemini 3.5 Flash with

Google

Across the field

All comparisons