Claude Opus 4.5 vs Grok 3
Wins 7 of 7 areas
Coding · Agents · Reasoning · Facts · Images and charts · Long documents · Following instructions
Wins 0 of 7 areas
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Claude Opus 4.5 is the stronger all-rounder.Grok 3 is cheaper.
Scores updated · 25 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. 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 thinking40Claude Opus 4.54 of 4 tests
- CodingWriting and fixing software20Claude Opus 4.52 of 2 tests
- FactsGetting facts right instead of making them up21Claude Opus 4.52 of 3 tests
- AgentsCarrying out multi-step tasks on its own10Claude Opus 4.51 of 1 test
- Images and chartsUnderstanding pictures, charts and video10Claude Opus 4.51 of 1 test
- Long documentsFinding answers in very long texts10Claude Opus 4.51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Opus 4.51 of 1 test
Agents, images and charts, 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.
Grok 3 costs 20% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 4.5 pulls ahead
- Real work tasks from 44 professionsGDPVal+39points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+35.6points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+26.3points ahead
Where Grok 3 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 25 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.5
- Terminal-Bench HardClaude Opus 4.5 by 35.64711.4+35.6
- SciCodeClaude Opus 4.5 by 12.749.536.8+12.7
ReasoningClaude Opus 4.5
- ARC-AGI-2Claude Opus 4.5 by 37.637.60+37.6
- Humanity's Last ExamClaude Opus 4.5 by 2630.14.1+26
- GPQA DiamondClaude Opus 4.5 by 17.386.669.3+17.3
- CritPtClaude Opus 4.5 by 4.64.60+4.6
FactsClaude Opus 4.5
- AA-Omniscience · Non-hallucinationClaude Opus 4.5 by 26.33912.7+26.3
- AA-Omniscience · AccuracyClaude Opus 4.5 by 17.746.628.9+17.7
- Vectara HHEM hallucination ratelower is betterGrok 3 by 5.110.95.8+5.1
Following instructionsClaude Opus 4.5
- IFBenchClaude Opus 4.5 by 11.15846.9+11.1
Other results12 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.
- ARC-AGI-1Claude Opus 4.5 by 76.5825.5+76.5
- AA-OmniscienceClaude Opus 4.5 by 47.214-33.2+47.2
- τ²-Bench Telecom (AA run)Claude Opus 4.5 by 40.789.548.8+40.7
- AA Agentic IndexClaude Opus 4.5 by 3559.624.6+35
- Artificial Analysis Coding IndexClaude Opus 4.5 by 2847.819.8+28
- AA IntelligenceClaude Opus 4.5 by 1729.112.1+17
- LiveCodeBenchClaude Opus 4.5 by 7.68779.4+7.6
- vectara_answer_rateClaude Opus 4.5 by 5.798.793+5.7
- vectara_factual_consistencyGrok 3 by 5.189.194.2+5.1
- frontiermath_tier_4_v1Claude Opus 4.5 by 4.24.20+4.2
- vectara_avg_summary_lengthClaude Opus 4.5 by 18.6 rating points114.595.9+18.6 rating
- AIME 2025tie92.893.3tie
Questions people ask
Which is better, Claude Opus 4.5 or Grok 3?
Claude Opus 4.5 wins all seven areas where both have results: coding, agents, reasoning, facts, images and charts, long documents and following instructions. Grok 3 wins none, but costs 20% less.
Which is better for coding?
Claude Opus 4.5. It wins 2 of the 2 coding tests both models report; Grok 3 wins none.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 3 costs $4.00 and $20.00. That makes Grok 3 about 20% cheaper for the same work.
How do you compare the two?
We use the 25 benchmark tests both models have published scores on. The verdict counts the 13 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 12 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.