Pricing · Anthropic
Claude Sonnet 4.5
Anthropic's claude-sonnet-4-5-20250929, 200K tokens of context. Every number on this page was read off Anthropic's own pricing
page — never estimated, never recalled from memory.
Status at Anthropic
- Status: Deprecated
- "Claude Sonnet 4.5 is deprecated: it is still functional but no longer recommended, and retires on November 30, 2026. Recommended replacement: Claude Sonnet 5.5." Claude Sonnet 5.5 pricing →
- Deprecated September 30, 2026. Retires November 30, 2026.
- Released September 29, 2025.
- Reliable knowledge cutoff Jan 2025; training data cutoff Jul 2025.
- Thinking: Extended. Default effort: —.
Read on Anthropic's model page on October 1, 2026.
Pricing
| Input | $3.00 | per 1M tokens |
|---|---|---|
| Output | $15.00 | per 1M tokens |
| Cached input | $0.30 | per 1M tokens · 0.1× the input price |
| Cache write (5 min TTL) | $3.75 | per 1M tokens |
| Cache write (1 h TTL) | $6.00 | per 1M tokens |
| Batch API | −50% | off input and output · verified September 16, 2026 against Anthropic's pricing page |
At the calculator's starting volume, 1M input tokens and 200K output tokens with no cache hits, Claude Sonnet 4.5 costs $6.00: $3.00 for input and $3.00 for output, at the prices above. Same formula as the calculator; change the volume there.
Where this price sits
Claude Sonnet 4.5 is deprecated and is not counted among the current models. Placed against the 67 current models with a verified price on this site, its $3.00 per 1M input tokens would be the 52nd cheapest of 68, and the 4th of 15 from Anthropic. Output costs 5.0× the input price.
Other current models in the Sonnet family:
- Claude Sonnet 5.5 1M tokens $2.00 in · $10.00 out
- Claude Sonnet 5 1M tokens $2.00 in · $10.00 out
- Claude Sonnet 4.6 1M tokens $3.00 in · $15.00 out
Other price lists Anthropic publishes for Claude Sonnet 4.5
The prices above are Anthropic's Standard list, the one the table and the calculator use. Anthropic also sells Claude Sonnet 4.5 on one other list, each with a condition. Figures and wording are quoted from Anthropic's own pages as read on the date shown; this site computes none of them.
-
Batch · 50% discount on both input and output tokens · wait: results when the batch completes or after 24 hours
Printed for Claude Sonnet 4.5: $1.50 input, $7.50 output, per 1M tokens.
The Batch API allows asynchronous processing of large volumes of requests with a 50% discount on both input and output tokens.
You can access batch results when all messages have completed or after 24 hours, whichever comes first.
Source, read September 16, 2026
Succession
Replaced by Claude Sonnet 5.5 (shutdown November 30, 2026).
Specifications
| API model id | claude-sonnet-4-5-20250929 | |
|---|---|---|
| Provider | Anthropic | |
| Family | Sonnet | |
| Context window | 200K tokens | |
| Max output | 64K tokens | |
| Released | September 29, 2025 | |
| Status | Deprecated | |
| Retires on | November 30, 2026 | |
Claude Sonnet 4.5 was released on September 29, 2025. It returns up to 64K tokens per response, against a context window of 200K tokens.
Shutdowns at Anthropic on record
2 dated shutdowns this site has recorded for Anthropic, each with its source. Dates after today are announced, not past.
| Date | What | Source |
|---|---|---|
| August 5, 2026 | Retirement of Claude Opus 4.1 | Source |
| November 30, 2026 (announced) | Retirement of Claude Sonnet 4.5 (deprecated September 30, 2026; Anthropic recommends Claude Sonnet 5.5) | Source |
Questions about Claude Sonnet 4.5 pricing
- How much does Claude Sonnet 4.5 cost per million tokens?
- $3.00 per 1M input tokens and $15.00 per 1M output tokens, read on Anthropic's official pricing page on September 28, 2026.
- What does a cached input token cost on Claude Sonnet 4.5?
- $0.30 per 1M cached input tokens, 10% of the $3.00 input price; a 5-minute cache write costs $3.75, a 1-hour cache write costs $6.00 per 1M tokens.
- When will Claude Sonnet 4.5 be retired?
- Anthropic has set its retirement for November 30, 2026.
Verified September 28, 2026 against Anthropic's official pricing page. Confidence: confirmed. No price change recorded for this model. How the data is checked.
Other Anthropic models with a verified price
- Claude Haiku 4.5 Haiku $1.00 in · $5.00 out
- Claude Sonnet 5.5 Sonnet $2.00 in · $10.00 out
- Claude Sonnet 5 Sonnet $2.00 in · $10.00 out
- Claude Sonnet 4.6 Sonnet $3.00 in · $15.00 out
- Claude Opus 5.5 Opus $4.00 in · $20.00 out
- Claude Opus 5 Opus $5.00 in · $25.00 out
- Claude Opus 4.8 Opus $5.00 in · $25.00 out
- Claude Opus 4.7 Opus $5.00 in · $25.00 out
- Claude Opus 4.6 Opus $5.00 in · $25.00 out
- Claude Opus 4.5 Opus $5.00 in · $25.00 out
- Claude Fable 5.1 Fable $10.00 in · $50.00 out
- Claude Mythos 5.1 Mythos $10.00 in · $50.00 out
- Claude Fable 5 Fable $10.00 in · $50.00 out
- Claude Mythos 5 Mythos $10.00 in · $50.00 out
Cheaper or equally priced alternatives
Current models with an input price at or below $3.00 per 1M tokens.
- Claude Sonnet 4.6 Anthropic $3.00 in · $15.00 out
- Command A Cohere $2.50 in · $10.00 out
- Command R+ (08-2024) Cohere $2.50 in · $10.00 out
- Qwen3.7-Max Alibaba (Qwen) $2.50 in · $7.50 out
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