Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
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AnthropicMultimodal

Claude Sonnet 4.5

Balanced

The Sonnet that established the Claude 4 line as the default mid-tier choice. Still widely deployed where 4.6 hasn't been re-validated.

Claude Sonnet 4.5 is a multimodal AI model from Anthropic. It costs $3.000 per million input tokens and $15.000 per million output tokens (blended $6.600/M), with a 200K-token context window.

Released Sep 2025Modalities text, visionOfficial model page ↗Provider pricing ↗API docs ↗Compare with another model →Estimate monthly cost →
INPUT
$3.000/M
per million input tokens
OUTPUT
$15.000/M
per million output tokens
BLENDED 70/30
$6.600/M
default reference rate · how it's calculated →
CONTEXT
200K
200,000 tokens
What it's good at
  • Strong coding for the price
  • 1M context
  • Solid vision
  • Wide ecosystem support
Typical use cases
  • Mid-cost production chat
  • Existing Sonnet 4.5 pipelines
  • Document Q&A
Benchmarks
vs. best public score
MMLU85%
Multitask academic knowledge across 57 subjects.
GPQA Diamond73%
Graduate-level science questions, "Google-proof".
MATH86%
High-school competition math problems.
HumanEval91%
Python function synthesis from docstrings.
SWE-bench Verified62%
Real GitHub issues solved end-to-end.
LMArena Elo1340 Elo
Crowd-sourced head-to-head preference Elo rating.
Hand-curated from each provider's published reports and public leaderboards. Methodology varies across sources — treat as directional rather than authoritative.
More from Anthropic
See all 16 →
Claude Fable 5
Frontier · 1M ctx
in $10.000/Mout $50.000/M
Claude Opus 4.8
Frontier · 1M ctx
in $5.000/Mout $25.000/M
Claude Opus 4.7
Previous · 1M ctx
in $5.000/Mout $25.000/M
Claude Opus 4.6
Previous · 1M ctx
in $5.000/Mout $25.000/M
Claude Sonnet 4.6
Balanced · 1M ctx
in $3.000/Mout $15.000/M
Claude Opus 4.5
Previous · 200K ctx
in $15.000/Mout $75.000/M
Frequently asked questions

How much does Claude Sonnet 4.5 cost?

Claude Sonnet 4.5 costs $3.000 per million input tokens and $15.000 per million output tokens, for a blended reference rate of $6.600 per million tokens.

What is Claude Sonnet 4.5's context window?

Claude Sonnet 4.5 supports up to 200K tokens of context (200,000 tokens).

What is Claude Sonnet 4.5 best for?

Claude Sonnet 4.5 is well suited to Strong coding for the price, 1M context and Solid vision.

Who makes Claude Sonnet 4.5?

Claude Sonnet 4.5 is developed and served by Anthropic. It was released in Sep 2025.