Claude Opus 4.6 vs Grok 4.1 Fast
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents
Wins 0 of 8 areas
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Claude Opus 4.6 is the stronger all-rounder.Grok 4.1 Fast is cheaper.
Scores updated · 27 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 thinking40Claude Opus 4.64 of 4 tests
- CodingWriting and fixing software30Claude Opus 4.63 of 3 tests
- FactsGetting facts right instead of making them up30Claude Opus 4.63 of 3 tests
- Images and chartsUnderstanding pictures, charts and video20Claude Opus 4.62 of 2 tests
- MathCompetition and research-level math20Claude Opus 4.62 of 2 tests
- AgentsCarrying out multi-step tasks on its own10Claude Opus 4.61 of 1 test
- Long documentsFinding answers in very long texts10Claude Opus 4.61 of 1 test
- Following instructionsDoing exactly what it is asked00Even0 each · 1 tie
Agents, 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 4.1 Fast costs 98% 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 4.6 pulls ahead
- Real work tasks from 44 professionsGDPVal+41.8points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+22points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+21.9points ahead
Where Grok 4.1 Fast pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 27 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.6
- LMArena · WebDevClaude Opus 4.6 by 306 rating points15461240+306 rating
- Terminal-Bench HardClaude Opus 4.6 by 2246.224.2+22
- SciCodeClaude Opus 4.6 by 7.751.944.2+7.7
ReasoningClaude Opus 4.6
- Humanity's Last ExamClaude Opus 4.6 by 20.639.919.3+20.6
- SimpleBenchClaude Opus 4.6 by 11.667.656+11.6
- CritPtClaude Opus 4.6 by 9.712.62.9+9.7
- GPQA DiamondClaude Opus 4.6 by 4.389.685.3+4.3
FactsClaude Opus 4.6
- AA-Omniscience · AccuracyClaude Opus 4.6 by 21.94725.1+21.9
- AA-Omniscience · Non-hallucinationClaude Opus 4.6 by 10.637.226.6+10.6
- Vectara HHEM hallucination ratelower is betterClaude Opus 4.6 by 712.219.2+7
Images and chartsClaude Opus 4.6
- MMMU-ProClaude Opus 4.6 by 12.175.463.3+12.1
- LMArena · VisionClaude Opus 4.6 by 115 rating points13161201+115 rating
MathClaude Opus 4.6
- HMMT Feb. 2026Claude Opus 4.6 by 9.896.286.4+9.8
- AIME 2026Claude Opus 4.6 by 2.596.794.2+2.5
Other results10 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.
- AA-OmniscienceClaude Opus 4.6 by 43.613.7-29.9+43.6
- AA Agentic IndexClaude Opus 4.6 by 34.767.632.9+34.7
- Artificial Analysis Coding IndexClaude Opus 4.6 by 28.648.119.5+28.6
- AA IntelligenceClaude Opus 4.6 by 11.531.920.4+11.5
- vectara_factual_consistencyClaude Opus 4.6 by 787.880.8+7
- vectara_avg_summary_lengthClaude Opus 4.6 by 38.1 rating points137.699.5+38.1 rating
- matharena_visual_math_overallClaude Opus 4.6 by 3.372.369+3.3
- HMMT Nov. 2025Claude Opus 4.6 by 396.393.3+3
- τ²-Bench Telecom (AA run)Grok 4.1 Fast by 1.292.193.3+1.2
- vectara_answer_ratetie99.899.7tie
Questions people ask
Which is better, Claude Opus 4.6 or Grok 4.1 Fast?
Claude Opus 4.6 wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and long documents. Grok 4.1 Fast wins none, but costs 98% less. They are level on following instructions.
Which is better for coding?
Claude Opus 4.6. It wins 3 of the 3 coding tests both models report; Grok 4.1 Fast wins none.
Which is cheaper?
Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Grok 4.1 Fast costs $0.20 and $0.50. That makes Grok 4.1 Fast about 98% cheaper for the same work.
How do you compare the two?
We use the 27 benchmark tests both models have published scores on. The verdict counts the 17 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 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.