Claude Opus 4.8 vs Gemini 3.8 Flash
Wins 1 of 8 areas
Math
Wins 5 of 8 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Gemini 3.8 Flash is the stronger all-rounder.Claude Opus 4.8 is better at math.
Scores updated · 39 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.
- ReasoningHard problems that need careful thinking14Gemini 3.8 Flash4 of 7 tests · 2 ties
- CodingWriting and fixing software14Gemini 3.8 Flash4 of 5 tests
- FactsGetting facts right instead of making them up12Gemini 3.8 Flash2 of 3 tests
- Long documentsFinding answers in very long texts01Gemini 3.8 Flash1 of 1 test
- Following instructionsDoing exactly what it is asked01Gemini 3.8 Flash1 of 1 test
- MathCompetition and research-level math30Claude Opus 4.83 of 3 tests
- AgentsCarrying out multi-step tasks on its own11Even1 each · 1 tie
- Images and chartsUnderstanding pictures, charts and video11Even1 each
Long documents and following instructions rest on a single test each.
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.
Gemini 3.8 Flash costs 85% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Gemini 3.8 Flash pulls ahead
- Common-sense trick questionsSimpleBench+17.6points ahead
- Abstract visual puzzles that people can solveARC-AGI-2+17.1points ahead
- Short factual questions, answered correctlySimpleQA Verified+16.7points ahead
Where Claude Opus 4.8 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+34.1points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+15.9points ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+11.6points ahead
Every test, side by side
All 39 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3.8 Flash
- LiveBench · CodingClaude Opus 4.8 by 9.381.872.5+9.3
- LiveBench · Agentic CodingGemini 3.8 Flash by 3.750.554.2+3.7
- LMArena · WebDevGemini 3.8 Flash by 30 rating points15561586+30 rating
- Terminal-Bench 2.1Gemini 3.8 Flash by 384.687.6+3
- SciCodeGemini 3.8 Flash by 2.254.456.6+2.2
AgentsEven
- τ-Bench V3 · BankingGemini 3.8 Flash by 10.734.244.9+10.7
- Terminal-Bench 4.0Claude Opus 4.8 by 221.719.7+2
- GDPValtie47.746.8tie
ReasoningGemini 3.8 Flash
- SimpleBenchGemini 3.8 Flash by 17.664.882.4+17.6
- ARC-AGI-2Gemini 3.8 Flash by 17.172.189.2+17.1
- ARC-AGI-3Gemini 3.8 Flash by 8.91.510.4+8.9
- GPQA DiamondGemini 3.8 Flash by 3.39295.3+3.3
- CritPtClaude Opus 4.8 by 2.620.918.3+2.6
- Humanity's Last Examtie48.747.8tie
- LiveBench · Reasoningtie89.289.3tie
FactsGemini 3.8 Flash
- SimpleQA VerifiedGemini 3.8 Flash by 16.75369.7+16.7
- AA-Omniscience · Non-hallucinationClaude Opus 4.8 by 15.960.744.8+15.9
- AA-Omniscience · AccuracyGemini 3.8 Flash by 5.848.854.6+5.8
Images and chartsEven
- CharXiv (RQ)Claude Opus 4.8 by 3.789.986.2+3.7
- LMArena · VisionGemini 3.8 Flash by 20 rating points12941314+20 rating
MathClaude Opus 4.8
- FrontierMath Tier 4Claude Opus 4.8 by 34.156.121.9+34.1
- FrontierMath Tiers 1-3 (v2)Claude Opus 4.8 by 11.68068.4+11.6
- LiveBench · MathematicsClaude Opus 4.8 by 2.794.391.6+2.7
Following instructionsGemini 3.8 Flash
- LiveBench · Instruction FollowingGemini 3.8 Flash by 9.47281.4+9.4
Other results14 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.
- GDP (Surge AI)Claude Opus 4.8 by 49.884.835+49.8
- DeepSWE 1.1Gemini 3.8 Flash by 14.75973.7+14.7
- livebench_data_analysisClaude Opus 4.8 by 126654+12
- livebench_languageGemini 3.8 Flash by 8.179.787.8+8.1
- HiL-Bench (Tools-allowed)Gemini 3.8 Flash by 6.235.341.5+6.2
- ARC-AGI-1Gemini 3.8 Flash by 692.598.5+6
- GDPval-AA v2Claude Opus 4.8 by 48 rating points15931545+48 rating
- GDPval-AA v2 EloClaude Opus 4.8 by 48 rating points15931545+48 rating
- Terminal-Bench 4.0Claude Opus 4.8 by 4.523.619.1+4.5
- OSWorld 2.0Gemini 3.8 Flash by 3.355.759+3.3
- Artificial Analysis Coding IndexGemini 3.8 Flash by 274.376.3+2
- AA Agentic IndexClaude Opus 4.8 by 1.542.641.1+1.5
- AA Intelligencetie41.840.9tie
- AA-Omnisciencetie28.829.6tie
Questions people ask
Which is better, Claude Opus 4.8 or Gemini 3.8 Flash?
Gemini 3.8 Flash wins five of the eight areas we test: coding, reasoning, facts, long documents and following instructions. Claude Opus 4.8 wins math. They are level on agents and images and charts.
Which is better for coding?
Gemini 3.8 Flash. It wins 4 of the 5 coding tests both models report; Claude Opus 4.8 wins 1.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 3.8 Flash costs $0.75 and $3.75. That makes Gemini 3.8 Flash about 85% cheaper for the same work.
How do you compare the two?
We use the 39 benchmark tests both models have published scores on. The verdict counts the 25 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 14 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.