Claude Sonnet 4.5
Summary
Claude Sonnet 4.5 is a proprietary language model from Anthropic, released on 29 Sept 2025. It accepts text, images and PDFs and generates text, with a 1M-token context window and up to 64K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $3 per million input tokens and $15 per million output tokens (Claude API), across 9 providers we track.
Balanced Claude model for coding, analysis, agent workflows, and cost control
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Anthropic |
|---|---|
| Release date | 29 Sept 2025 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,000,000 tokens) [models.dev] |
| Max output | 64K tokens [models.dev] |
| Knowledge cutoff | 31 Jul 2025 [models.dev] |
| Input | Text, images and PDFs [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
Claude Sonnet 4.5 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Claude API claude-sonnet-4-5 | $3 | $15 | $0.30 | 1M | models.dev, 4 Oct 2026 |
| Claude API claude-sonnet-4-5-20250929 | $3 | $15 | $0.30 | 1M | models.dev, 4 Oct 2026 |
| Databricks databricks-claude-sonnet-4-5 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Databricks databricks-claude-sonnet-4 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Azure AI Foundry claude-sonnet-4-5 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Vertex AI (Claude) claude-sonnet-4-5@20250929 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Amazon Bedrock anthropic.claude-sonnet-4-5-20250929-v1:0 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Google Vertex AI claude-sonnet-4-5@20250929 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| Amazon Bedrock global.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3 | $15 | $0.30 | 200K | models.dev, 4 Oct 2026 |
| OpenRouter anthropic/claude-sonnet-4.5 | $3 | $15 | $0.30 | 1M | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway anthropic/claude-sonnet-4.5 | $3 | $15 | $0.30 | 1M | models.dev, 4 Oct 2026 |
| Amazon Bedrock us.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.30 | $16.50 | $0.33 | 200K | models.dev, 4 Oct 2026 |
| Amazon Bedrock au.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.30 | $16.50 | $0.33 | 200K | models.dev, 4 Oct 2026 |
| Amazon Bedrock eu.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.30 | $16.50 | $0.33 | 200K | models.dev, 4 Oct 2026 |
| Amazon Bedrock jp.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.30 | $16.50 | $0.33 | 200K | models.dev, 4 Oct 2026 |
| Snowflake Cortex claude-sonnet-4-5 | – | – | – | 200K | models.dev, 4 Oct 2026 |
Frequently asked questions
What is the context window of Claude Sonnet 4.5?
Claude Sonnet 4.5 has a context window of 1,000,000 tokens (1M) and can generate up to 64,000 tokens in a single response, according to models.dev.
How much does the Claude Sonnet 4.5 API cost?
Through Claude API, Claude Sonnet 4.5 costs $3 per million input tokens and $15 per million output tokens. Prices last verified 4 Oct 2026.
Is Claude Sonnet 4.5 open source?
No. Claude Sonnet 4.5 is a proprietary model; Anthropic has not released its weights. It is available through APIs including Claude API, Databricks, Azure AI Foundry, Vertex AI (Claude).
When was Claude Sonnet 4.5 released?
Anthropic released Claude Sonnet 4.5 on 29 Sept 2025, according to models.dev.
Which providers offer Claude Sonnet 4.5?
We track Claude Sonnet 4.5 on 9 providers: Claude API, Databricks, Azure AI Foundry, Vertex AI (Claude), Amazon Bedrock, Google Vertex AI, OpenRouter, Vercel AI Gateway, Snowflake Cortex.
Change history
No changes detected since we started tracking this model. We re-check every source daily.
Sources
- https://github.com/sst/models.dev/blob/dev/providers/anthropic/models/claude-sonnet-4-5.toml
- https://github.com/sst/models.dev/blob/dev/providers/anthropic/models/claude-sonnet-4-5-20250929.toml
- https://github.com/sst/models.dev/blob/dev/providers/databricks/models/databricks-claude-sonnet-4-5.toml
- https://github.com/sst/models.dev/blob/dev/providers/databricks/models/databricks-claude-sonnet-4.toml
- https://github.com/sst/models.dev/blob/dev/providers/azure/models/claude-sonnet-4-5.toml
- https://github.com/sst/models.dev/blob/dev/providers/google-vertex-anthropic/models/claude-sonnet-4-5@20250929.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://github.com/sst/models.dev/blob/dev/providers/google-vertex/models/claude-sonnet-4-5@20250929.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/global.anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://openrouter.ai/anthropic/claude-sonnet-4.5
- https://github.com/sst/models.dev/blob/dev/providers/vercel/models/anthropic/claude-sonnet-4.5.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/au.anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/eu.anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/jp.anthropic.claude-sonnet-4-5-20250929-v1:0.toml
- https://github.com/sst/models.dev/blob/dev/providers/snowflake-cortex/models/claude-sonnet-4-5.toml