// Anthropic
Claude Sonnet 4.5
A Anthropic model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- $3 / $15
- Lowest (official)
- $3 / $15
- Context
- 1M
- Prices listed
- 1
Prices checked 2026-10-10Official sources linked on every rowNo estimatesCheapest LLM APIs →
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | Anthropic |
|---|---|
| Context window | 1M (1,000,000 tokens) |
| Max output | 64K |
| Input | Text · Image · File/PDF |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Closed · Proprietary (API only) |
| Released | Sep 29, 2025 (OpenRouter listing date) |
| Model IDs | claude-sonnet-4-5 |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| Official Vendor API, billed in USD | Official 10-10 | $3 | $15 | $0.3 | 6 | 1M | Batch −50%Batch -50%; cache write 5m=1.25x input, 1h=2x input |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Vendor API, billed in USD
Official
04Performance
All results →Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
| Benchmark | Best score | Source | Date |
|---|---|---|---|
| LMArena Text | 1456 | official | 2026-10-08 |
| LMArena WebDev | 1393 | official | 2026-10-08 |
| GPQA Diamond | 82.3% | independent | 2025-10-28 |
| SWE-bench Verified | 74.8% | official | 2025-11-03 |
| AIME (OTIS Mock AIME 2024–2025) | 77.8% | independent | 2025-10-28 |
| MATH Level 5 | 97.7% | independent | 2025-10-21 |
| Humanity's Last Exam | 13.7% | compiled | 2025-09-29 |
| OSWorld (Verified) | 62.9% | official | 2025-10-30 |
| τ²-bench | 98.0% | vendor | 2025-09-29 |
| Terminal-Bench 2.0 | 46.5% | official | 2025-09-29 |
| BFCL v4 (function calling) | 73.2% | official | 2026-10-17 |
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
No price change recorded since we started tracking (2026-10-10).
06More from Anthropic
FAQ
How much does the Claude Sonnet 4.5 API cost?
On the official pricing page: $3 / $15 per 1M input / output tokens, cached input $0.3 (checked 2026-10-10).
What is the context window of Claude Sonnet 4.5?
1M tokens of context, up to 64K output tokens. Platforms may cap it lower – see the table.
Is Claude Sonnet 4.5 open source?
No. It is only available through APIs and the vendor’s apps.