Claude Haiku 4.5 vs Grok Code Fast 1
Wins 3 of 6 areas
Coding · Long documents · Following instructions
Wins 1 of 6 areas
Agents
Claude Haiku 4.5 wins more areas, narrowly.Grok Code Fast 1 is cheaper and better at agents.
Scores updated · 17 tests both models report · How we compare
Where each one wins
Tests won in each of the six 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.
- CodingWriting and fixing software40Claude Haiku 4.54 of 4 tests
- Long documentsFinding answers in very long texts10Claude Haiku 4.51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Haiku 4.51 of 1 test
- AgentsCarrying out multi-step tasks on its own01Grok Code Fast 11 of 1 test
- ReasoningHard problems that need careful thinking11Even1 each · 1 tie
- FactsGetting facts right instead of making them up11Even1 each
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 Code Fast 1 costs 72% 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 Haiku 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+52points ahead
- Reasons across sets of long documentsAA-LCR+21.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+12.9points ahead
Where Grok Code Fast 1 pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+5.6points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+5.5points ahead
- Real work tasks from 44 professionsGDPVal+1.3points ahead
Every test, side by side
All 17 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Haiku 4.5
- LMArena · WebDevClaude Haiku 4.5 by 166 rating points13291163+166 rating
- Terminal-Bench HardClaude Haiku 4.5 by 9.927.317.4+9.9
- SciCodeClaude Haiku 4.5 by 642.236.2+6
- SWE-bench VerifiedClaude Haiku 4.5 by 2.573.370.8+2.5
ReasoningEven
- GPQA DiamondGrok Code Fast 1 by 5.567.272.7+5.5
- Humanity's Last ExamClaude Haiku 4.5 by 2.410.48+2.4
- CritPttie00tie
FactsEven
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 5272.720.7+52
- AA-Omniscience · AccuracyGrok Code Fast 1 by 5.61823.6+5.6
Following instructionsClaude Haiku 4.5
- IFBenchClaude Haiku 4.5 by 12.954.341.4+12.9
Other results5 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 Haiku 4.5 by 32.7-4.4-37.1+32.7
- AA Agentic IndexGrok Code Fast 1 by 25.310.335.6+25.3
- τ²-Bench Telecom (AA run)Grok Code Fast 1 by 2154.775.7+21
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 20.243.923.7+20.2
- AA IntelligenceClaude Haiku 4.5 by 2.816.914.1+2.8
Questions people ask
Which is better, Claude Haiku 4.5 or Grok Code Fast 1?
Claude Haiku 4.5 wins three of the six areas where both have results: coding, long documents and following instructions. Grok Code Fast 1 wins agents, and costs 72% less. They are level on reasoning and facts.
Which is better for coding?
Claude Haiku 4.5. It wins 4 of the 4 coding tests both models report; Grok Code Fast 1 wins none.
Which is cheaper?
Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Grok Code Fast 1 costs $0.20 and $1.50. That makes Grok Code Fast 1 about 72% cheaper for the same work.
How do you compare the two?
We use the 17 benchmark tests both models have published scores on. The verdict counts the 12 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 5 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.