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Claude Sonnet 4.5 vs GPT-5.4 Pro

Claude Sonnet 4.5 high Anthropic GPT-5.4 Pro OpenAIOpen in the comparison tool
Verdict
  • GPT-5.4 Pro leads on quality: 64.3 vs 57.9.
  • Claude Sonnet 4.5 (high) is stronger in coding, human preference.
  • GPT-5.4 Pro is stronger in reasoning, instruction following, knowledge, multimodal.
  • Claude Sonnet 4.5 (high) is 11× cheaper ($6.00 vs $67.50 per 1M blended).
  • Claude Sonnet 4.5 (high) streams 40.0× faster (40 vs 1 tokens per second).
MetricClaude Sonnet 4.5 (high)GPT-5.4 Pro
BenchLeader Index57.964.3
Coding score56.4–
Human preference score65.3–
Reasoning score66.475.3
Instruction following score–67.3
Knowledge score–73.6
Multimodal score–69.8
Blended price $/M$6.00$67.50
Output speed40 tok/s1 tok/s
Time to first answer1.2 s6.3 s
Context window1M1.1M
Humanity's Last Exam–44.3%
SimpleBench–74.1%
Epoch Capabilities Index–158.9
LMArena Text1456–
LMArena Hard Prompts1487–
LMArena Coding1520–
LMArena WebDev1393–
MultiChallenge–69.2%
VISTA–53.9%
MultiNRC–62.3%
TutorBench–56.6%
SWE-bench Verified (bash only)71.4%–

Data as of 2026-09-13. Best configuration of each model; every score links to its source on the model pages.

Claude Sonnet 4.5 vs GPT-5.4 Pro: questions

Is Claude Sonnet 4.5 better than GPT-5.4 Pro?
GPT-5.4 Pro leads on quality: 64.3 vs 57.9. The BenchLeader Index combines every independent quality benchmark; GPT-5.4 Pro is ahead overall as of 2026-09-13, but check the category scores for your use.
Which is cheaper, Claude Sonnet 4.5 or GPT-5.4 Pro?
Claude Sonnet 4.5 is cheaper: $6.00 against $67.50 per million tokens, blended at three input tokens per output token.
Which is faster, Claude Sonnet 4.5 or GPT-5.4 Pro?
Claude Sonnet 4.5 streams faster: 40 against 1 output tokens per second.
Which has the larger context window?
GPT-5.4 Pro accepts more context: 1.1M against 1M tokens.