All prices › Anthropic › Claude Sonnet 4.5
Claude Sonnet 4.5 API pricing
As of October 16, 2026, Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens on the Anthropic API. Cached input is $0.30 per million. Anthropic plans to retire it on November 30, 2026.
Retires Nov 30
It is the 5th cheapest of 16 Claude models tracked here, by blended price. The closest Premium-tier model from another provider is GPT-5.4 (OpenAI) at $2.50 / $15.00; Claude Sonnet 4.5 is 7% more expensive. Same list price as Claude Sonnet 4.6. First listed in the LiteLLM price data on September 29, 2025.
Input / 1M tokens$3.00
Output / 1M tokens$15.00
Context window200K
Max output64K
Every published rate
| Rate | Per 1M tokens |
|---|---|
| Input (standard) | $3.00 |
| Output (standard) | $15.00 |
| Cached input (read) | $0.30 |
| Cache write | $3.75 |
| Batch input | $1.50 |
| Batch output | $7.50 |
What it costs in practice
| Task | Tokens | Per request | Per 1,000 requests |
|---|---|---|---|
| Chatbot reply | 1,000 in / 500 out | $0.01 | $10.50 |
| Summarize a long document | 20,000 in / 1,000 out | $0.07 | $75.00 |
| Coding agent step | 50,000 in / 2,000 out | $0.18 | $180 |
Standard rates, no caching or batch discount. Compare your own numbers across all models →
Price history
| Date | Model | Change |
|---|---|---|
| 2026-10-09 | Claude Sonnet 4.5 | Context window: 1M → 200K (-80%) source |
| 2026-09-16 | Claude Sonnet 4.5 | Context window: 200K → 1M (+400%) source |
| 2025-09-29 | Claude Sonnet 4.5 | New model listed: $3 in / $15 out source |
Dates are when each change first appeared in the LiteLLM price data, usually within days of the provider's announcement.
Details
| Provider | Anthropic |
| Price tier | Premium |
| Features | Vision, Reasoning, Prompt caching, Tool use, PDF input |
| API model names | claude-sonnet-4-5, claude-sonnet-4-5-20250929 |
| Retirement date | November 30, 2026 |
| Official pricing | platform.claude.com |
Models at a similar price
| Model | Input / 1M | Output / 1M |
|---|---|---|
| GPT-5.2 | $1.75 | $14.00 |
| GPT-5.4 | $2.50 | $15.00 |
| Claude Sonnet 4.6 | $3.00 | $15.00 |
| Claude Opus 5.5 | $4.00 | $20.00 |
| GPT-5.6 | $4.00 | $20.00 |
| GPT-5.6 Sol | $4.00 | $20.00 |
Other Anthropic models
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Fable 5 | $10.00 | $50.00 |
| Claude Fable 5.1 | $10.00 | $50.00 |
| Claude Mythos 5 | $10.00 | $50.00 |
| Claude Mythos 5.1 | $10.00 | $50.00 |
| Claude Opus 4.5 | $5.00 | $25.00 |
| Claude Opus 4.6 | $5.00 | $25.00 |
| Claude Opus 4.7 | $5.00 | $25.00 |
| Claude Opus 5 | $5.00 | $25.00 |
| Claude Opus 4.8 | $5.00 | $25.00 |
| Claude Opus 5.5 | $4.00 | $20.00 |
| Claude Sonnet 4.6 | $3.00 | $15.00 |
| Claude Sonnet 5 | $2.00 | $10.00 |
| Claude Sonnet 5.5 | $2.00 | $10.00 |
| Claude Haiku 4.5 | $1.00 | $5.00 |
| Claude Haiku 5.5 | $0.10 | $0.50 |