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

Providers21

Inference availability

Providers

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

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Providers offering Claude Sonnet 4.5
Provider	Provider model ID	Context	Max output	Input	Output	Cache read	Capabilities	Docs
QiHang	`claude-sonnet-4-5-20250929`	200K	64K	$0.43	$2.14	—	ReasoningTools	Docs ↗
Vercel AI Gateway	`anthropic/claude-sonnet-4.5`	1M	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
DigitalOcean	`anthropic-claude-4.5-sonnet`	1M	64K	$3	$15	$0.3	ReasoningTools	Docs ↗
Venice AI	`claude-sonnet-4-5`	198K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Merge 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 ↗
Abacus	`claude-sonnet-4-5-20250929`	200K	64K	$3	$15	—	ReasoningTools	Docs ↗
Vertex (Anthropic)	`claude-sonnet-4-5@20250929`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Azure	`claude-sonnet-4-5`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Anthropic	`claude-sonnet-4-5-20250929`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
OpenCode	`claude-sonnet-4-5`	1M	64K	$3	$15	$0.3	ReasoningTools	Docs ↗
Amazon Bedrock	`anthropic.claude-sonnet-4-5-20250929-v1:0`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Databricks	`databricks-claude-sonnet-4`	200K	64K	$3	$15	$0.3	ReasoningTools	Docs ↗
Azure Cognitive Services	`claude-sonnet-4-5`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Vertex	`claude-sonnet-4-5@20250929`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Neon	`claude-sonnet-4`	200K	64K	$3	$15	$0.3	ReasoningTools	Docs ↗
NanoGPT	`claude-sonnet-4-5-20250929`	1M	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
LLM Gateway	`anthropic/claude-sonnet-4-5-20250929`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
NanoGPT	`anthropic/claude-sonnet-4.5`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
Tempr Gateway	`anthropic/claude-sonnet-4-5-20250929`	200K	64K	$3	$15	$0.3	ReasoningToolsJSON	Docs ↗
ZenMux	`anthropic/claude-sonnet-4.5`	1M	64K	$3	$15	$0.3	ReasoningTools	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 21 priced providers

Median input $3/M

Midpoint of listed rates

Highest input $3/M

7.0× the lowest listed rate

Output range $2.14 – $15

Per million output tokens

QiHang $0.43/MLowest

Vercel AI Gateway $3/M

DigitalOcean $3/M

Venice AI $3/M

Merge Gateway $3/M

DevPass (LLM Gateway) $3/M

Abacus $3/M

Vertex (Anthropic) $3/M

Azure $3/M

Anthropic $3/M

OpenCode $3/M

Amazon Bedrock $3/M

Databricks $3/M

Azure Cognitive Services $3/M

Vertex $3/M

Neon $3/M

NanoGPT $3/M

LLM Gateway $3/M

NanoGPT $3/M

Tempr Gateway $3/M

ZenMux $3/M

Cost calculator

Estimate a workload

Provider Input tokens 1,000,000 Output tokens 250,000 Cached input 0%

$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

No changes recorded

This record has not changed within the retained import history.

Provenance

Sources & verification

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

Methodology

Last verified: Oct 24, 2026
Status: Source-linked
Confidence: Medium
Catalog source: Models.dev

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://modelbench.lol/api/v1/models/anthropic/claude-sonnet-4-5-20250929

curl

curl "https://modelbench.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 across 21 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?

20 providers list this model: QiHang, Vercel AI Gateway, DigitalOcean, Venice AI, Merge Gateway, DevPass (LLM Gateway) and 14 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 Oct 24, 2026.

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