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Anthropic: Claude Sonnet 4.5

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

Source-linked claude-sonnet Closed weights Released 2025-09-29
API record Report
InputT
OutputT
Input price$3/M
Output price$15/M
Context200K
Max output64K
Providers18
Inference availability

Providers

Provider-specific identifiers, limits, and listed prices per million tokens. Every row links back to the provider's own documentation.

Report a price
Providers offering Claude Sonnet 4.5
ProviderProvider model IDContextMax outputInputOutputCache readCapabilitiesDocs
QiHang claude-sonnet-4-5-20250929 200K 64K $0.43 $2.14 ReasoningTools Docs ↗
OpenCode Zen claude-sonnet-4-5 1M 64K $3 $15 $0.3 ReasoningTools Docs ↗
Azure claude-sonnet-4-5 200K 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
NanoGPT claude-sonnet-4-5-20250929 1M 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Amazon Bedrock anthropic.claude-sonnet-4-5-20250929-v1:0 200K 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Vercel AI Gateway anthropic/claude-sonnet-4.5 1M 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Azure Cognitive Services claude-sonnet-4-5 200K 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Anthropic claude-sonnet-4-5-20250929 1M 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Databricks databricks-claude-sonnet-4 200K 64K $3 $15 $0.3 ReasoningTools Docs ↗
DigitalOcean anthropic-claude-4.5-sonnet 1M 64K $3 $15 $0.3 ReasoningTools Docs ↗
Vertex claude-sonnet-4-5@20250929 200K 64K $3 $15 $0.3 ReasoningTools Docs ↗
Merge Gateway anthropic/claude-sonnet-4-5-20250929 200K 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
Abacus claude-sonnet-4-5-20250929 200K 64K $3 $15 ReasoningTools Docs ↗
LLM Gateway anthropic/claude-sonnet-4-5-20250929 200K 64K $3 $15 $0.3 ReasoningToolsJSON Docs ↗
DevPass (LLM Gateway) claude-sonnet-4-5-20250929 200K 64K $3 $15 $0.3 ReasoningTools Docs ↗
Vertex (Anthropic) claude-sonnet-4-5@20250929 200K 64K $3 $15 $0.3 ReasoningTools Docs ↗
Neon claude-sonnet-4 200K 64K $3 $15 $0.3 ReasoningTools Docs ↗
Venice AI claude-sonnet-4-5 198K 64K $3.75 $18.75 $0.375 ReasoningToolsJSON Docs ↗

Capability badges appear only where the provider catalog explicitly lists support. A blank cell means the source is silent, not that the feature is absent.

Listed rates

Price across providers

Input price per million tokens as published by each provider. Bars are drawn from listed rates only — no traffic weighting, since the catalog observes no requests.

Lowest input $0.43/M

Across 18 priced providers

Median input $3/M

Midpoint of listed rates

Highest input $3.75/M

8.7× the lowest listed rate

Output range $2.14 – $18.75

Per million output tokens

QiHang $0.43/MLowest
OpenCode Zen $3/M
Azure $3/M
NanoGPT $3/M
Amazon Bedrock $3/M
Vercel AI Gateway $3/M
Azure Cognitive Services $3/M
Anthropic $3/M
Databricks $3/M
DigitalOcean $3/M
Vertex $3/M
Merge Gateway $3/M
Abacus $3/M
LLM Gateway $3/M
DevPass (LLM Gateway) $3/M
Vertex (Anthropic) $3/M
Neon $3/M
Venice AI $3.75/M
Cost calculator

Estimate a workload

$0.00
Excludes taxes, non-token charges, and tiered discounts.

Context limits also differ by provider, from 198K to 1M tokens. Compare the provider table above before choosing on price alone.

Specification

Capabilities

Recorded from the source catalog and provider listings.

Reasoning Yes
Tool calling Yes
Structured output Yes
Attachments Yes
Vision input Yes
× Open weights No
Creator
Anthropic
Model family
claude-sonnet
Knowledge cutoff
2025-07-31
License
Not documented
Release date
2025-09-29
Model ID
anthropic/claude-sonnet-4-5-20250929
Published evaluations

Benchmarks

Every result stays attached to its source, version, metric and harness. Scores from different versions are never merged, and the profile below plots each benchmark against its own population rather than on a shared scale.

Benchmark registry
No published benchmark results

ModelBench does not infer quality from price, context size, or model name. When a source publishes a comparable result, it appears here with its version and link.

Read the methodology
Catalog activity

Change log

Field-level changes detected between successful source imports.

Full change log
Price Completion2.14 → 15.0
Price Prompt0.43 → 3.0
Provenance

Sources & verification

Every figure on this page traces back to one of these records.

Methodology
Public API

Use this record

Fetch the complete source-linked model record. No key, no account, no rate-limited tier.

API documentation
Endpoint
GET https://model.kyssta.lol/api/v1/models/anthropic/claude-sonnet-4-5-20250929
curl
curl "https://model.kyssta.lol/api/v1/models/anthropic/claude-sonnet-4-5-20250929"
Common questions

Frequently asked questions

Answered directly from the stored record — nothing here is generated beyond the catalog's own fields.

What is Claude Sonnet 4.5?

Balanced Claude model for coding, analysis, agent workflows, and cost control. It is published by Anthropic and catalogued here from Models.dev.

How much does Claude Sonnet 4.5 cost?

Listed input pricing starts at $0.43 per million tokens from QiHang, rising to $3.75 across 18 listed providers.

What is the context length of Claude Sonnet 4.5?

Claude Sonnet 4.5 accepts up to 200K tokens of context and returns up to 64K output tokens.

Does Claude Sonnet 4.5 support tool calling and structured output?

Provider catalogs list support for tool calling, structured output, reasoning, and image input.

Which providers serve Claude Sonnet 4.5?

18 providers list this model: QiHang, OpenCode Zen, Azure, NanoGPT, Amazon Bedrock, Vercel AI Gateway and 12 more.

Are the weights for Claude Sonnet 4.5 open?

No. This model is served through hosted APIs only.

When was Claude Sonnet 4.5 released?

The catalog records a release date of 2025-09-29, last verified Sep 11, 2026.

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