Anthropic · 2025-09-29
Claude Sonnet 4.5 pricing
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows.
Prices from OpenRouter’s models API, updated October 29, 2026
What Claude Sonnet 4.5 costs a month
| Workload | Standard | Batch API |
|---|---|---|
| Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out | $315 | $158 |
| Daily summaries: 10,000 a day, 3,000 tokens in, 300 out | $4,050 | $2,025 |
| Coding agent: 400 calls a day, 60,000 tokens in (80% cached), 2,000 out | $965 | $569 |
30 days. Cached input billed at the cache-read price. Use your own numbers.
Cheaper models with a similar context window
| Model | Provider | Input /1M | Output /1M | Cache read /1M | Context | Chatbot, per month* |
|---|---|---|---|---|---|---|
| GLM 5.3 Flash | Z.ai | $0.046 | $0.074 | $0.03 | 1.05M | $2.95 |
| Ling 3.0 Flash VL | inclusionai | $0.06 | $0.18 | $0.012 | 131K | $4.86 |
| Ternary Bonsai 2 9B | prism-ml | $0.08 | $0.13 | $0.04 | 262K | $5.16 |
| Nex-N2.5-Pro | nex-agi | $0.075 | $0.25 | $0.015 | 262K | $6.38 |
| Muse Spark 1.3 Contributor | Meta | $0.10 | $0.20 | $0.002 | 1.05M | $6.90 |
* Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out, 30 days, no caching. Prices in US dollars per 1M tokens.
Cheaper isn’t automatically as good. Glow’s GlowBench scores models on your kind of task before suggesting a swap.
Other Claude models
| Model | Input /1M | Output /1M | Cache read /1M | Context | Chatbot, per month* |
|---|---|---|---|---|---|
| Claude Haiku 5.5 | $0.10 | $0.50 | $0.01 | 1M | $10.50 |
| Claude Sonnet 5.5 | $2 | $10 | $0.10 | 1M | $210 |
| Claude Opus 5.5 | $4 | $20 | $0.20 | 1M | $420 |
| Claude Fable 5.1 | $10 | $50 | $0.25 | 1M | $1,050 |
| Claude Opus 5 | $5 | $25 | $0.50 | 1M | $525 |
| Claude Sonnet 5 | $2 | $10 | $0.20 | 1M | $210 |
* Support chatbot: 1,000 chats a day, 1,500 tokens in, 400 out, 30 days, no caching. Prices in US dollars per 1M tokens.
Related
Claude Sonnet 4.5: questions
How much does Claude Sonnet 4.5 cost?
$3 per 1M input tokens and $15 per 1M output tokens, with cached input at $0.30, or $1.50 / $7.50 through the batch API. A 1,000-token prompt with a 500-token answer costs about $0.011.
What is Claude Sonnet 4.5’s context window?
1,000,000 tokens, with up to 64,000 output tokens per response.
Is there a cheaper alternative to Claude Sonnet 4.5?
GLM 5.3 Flash costs $0.046 in and $0.074 out per 1M tokens with a similar context window. Whether it matches Claude Sonnet 4.5’s quality depends on the task: test it on your own prompts (Glow’s GlowBench does this per task).
Know what each model really costs you.
Connect OpenRouter and Glow shows spend by model, key and product, and flags the swap that saves the most at the same quality.
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