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AnthropicTextRare

Claude Sonnet 4.5

Balanced Claude model for coding, analysis, agent workflows, and cost control

claude-sonnet-4-5-20250929
Type
Text
Quality
74 · Top 26% on the Epoch Capabilities Index
Context window
200,000 tokens
Max output
64,000 tokens
Input price
$3.00 / 1M tokens
Output price
$15.00 / 1M tokens
Cache read
$0.30 / 1M tokens
Cache write
$3.75 / 1M tokens
Released
Sep 29, 2025
Knowledge cutoff
Jul 2025
Takes in
Text, Image, PDF
Puts out
Text
Reasoning
Yes
Tool calling
Yes
Structured output
Yes
File attachments
Yes
Access
Paid
License
Proprietary
Rarity
Rare
Set number
665/1044
Open Anthropic docsQuality 74Where to run it 39Evolution 1/4Meet its creatureBattle Kimi K3

Weights aren’t public. Use is governed by Anthropic’s terms. Specs from models.dev, last changed Oct 19, 2026. Official source: docs.anthropic.com.

How good is it?

Public leaderboard scores for Claude Sonnet 4.5, refreshed daily from Epoch AI and LMArena.

Top 26% of the 277 models on the Epoch Capabilities Index: #73.

Quality is the share of a leaderboard’s models this one beats, from 0 to 100. Chat models are rated on Epoch AI’s Capabilities Index when it lists them, otherwise on LMArena; image and video models on LMArena’s image and video arenas.

Leaderboards

Benchmarks Epoch AI runs

Scores from Epoch AI and LMArena, licensed CC BY 4.0. Boards list models under their own names, so a close match is shown with the name it was scored under. Credits

Where to run it

39 providers sell Claude Sonnet 4.5 through an API. Prices are per million tokens, cheapest first.

API providers

ProviderInputOutputContext
QiHangCheapest paidclaude-sonnet-4-5-20250929$0.43$2.14200K
Poeanthropic/claude-sonnet-4.5$2.60$13.00983K
Jiekou.AIclaude-sonnet-4-5-20250929$2.70$13.50200K
Cortecsclaude-4-5-sonnet$2.99$14.95200K
302.AIclaude-sonnet-4-5-20250929$3.00$15.00200K
Abacusclaude-sonnet-4-5-20250929$3.00$15.00200K
Amazon Bedrockanthropic.claude-sonnet-4-5-20250929-v1:0$3.00$15.00200K
AnthropicOfficialclaude-sonnet-4-5$3.00$15.00200K
Azureclaude-sonnet-4-5$3.00$15.00200K
Azure Cognitive Servicesclaude-sonnet-4-5$3.00$15.00200K
Show 29 more providers
ProviderInputOutputContext
Cloudflare AI Gatewayanthropic/claude-sonnet-4.5$3.00$15.00200K
Databricksdatabricks-claude-sonnet-4$3.00$15.00200K
DevPass (LLM Gateway)claude-sonnet-4-5$3.00$15.00200K
Heliconeclaude-4.5-sonnet$3.00$15.00200K
Impossiblanthropic/claude-sonnet-4-5$3.00$15.00200K
Kilo Gatewayanthropic/claude-sonnet-4.5$3.00$15.001M
LLM Gatewayanthropic/claude-sonnet-4-5$3.00$15.00200K
Merge Gatewayanthropic/claude-sonnet-4-5-20250929$3.00$15.00200K
NanoGPTanthropic/claude-sonnet-4.5$3.00$15.00200K
NEAR AI Cloudanthropic/claude-sonnet-4-5$3.00$15.00200K
Neonclaude-sonnet-4-5$3.00$15.00200K
Ofoxanthropic/claude-sonnet-4.5$3.00$15.00200K
OpenCodeclaude-sonnet-4-5$3.00$15.001M
OpenRouteranthropic/claude-sonnet-4.5$3.00$15.001M
OrcaRouteranthropic/claude-sonnet-4.5$3.00$15.001M
Perplexity Agentanthropic/claude-sonnet-4-5$3.00$15.00200K
Pioneerclaude-sonnet-4-5$3.00$15.001M
Requestyclaude-sonnet-4-5$3.00$15.001M
Tempr Gatewayanthropic/claude-sonnet-4-5$3.00$15.00200K
Venice AIclaude-sonnet-4-5$3.00$15.00198K
Vercel AI Gatewayanthropic/claude-sonnet-4.5$3.00$15.00200K
Vertexclaude-sonnet-4-5@20250929$3.00$15.00200K
Vertex (Anthropic)claude-sonnet-4-5@20250929$3.00$15.00200K
ZenMuxanthropic/claude-sonnet-4.5$3.00$15.001M
AIHubMixclaude-sonnet-4-5$3.30$16.501M
Opperclaude-sonnet-4-5$3.30$16.50200K
AI/ML APIanthropic/claude-sonnet-4.5$4.13$20.63200K
AnyAPIanthropic/claude-sonnet-4-5——200K
Snowflake Cortexclaude-sonnet-4-5——200K

From models.dev and Hugging Face, checked daily. Resellers’ listings can lag behind their price pages, so confirm with the provider before you commit.

Face off

Current text models from other labs at a similar output price.

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