Anthropic: Claude Sonnet 4.5
Anthropic Claude Sonnet 4.5 API pricing
Claude Sonnet 4.5 costs $1.20 per million input tokens and $6.00 per million output tokens on Oxyy. These are the pay-as-you-go prices after the current 60% discount (Launch Promo; standard price $3.00 input and $15.00 output), and cached input tokens are billed at $0.120 per million. It accepts text, images and files and returns text, with a 200K-token context window and up to 64K output tokens per response. A cheaper Anthropic option is Claude Sonnet 5 at $0.800 / $4.00 per 1M tokens; for every model and rate, see Claude API pricing.
Providers
Where this model runs, and what each route costs. Requests are sent to a healthy provider automatically; if one errors, the gateway retries against another serving the same model.
| Provider | Input /M | Output /M | Cache read /M | Latency | Throughput |
|---|---|---|---|---|---|
| Anthropic | $1.20 | $6.00 | $0.120 | 2.97s | 182 tps |
Capabilities (16)
Supported parameters (6)
A parameter not listed here may be removed before the request reaches the model. When it is, the request still succeeds and the response names it, with the reason, in provider_specific_fields.dropped_params.
Pricing
What this model costs on Oxyy, pay as you go. "Charged" is the rate a request is billed at; the standard price is shown beside it for reference.
| Rate | Standard price | Charged | Unit |
|---|---|---|---|
| Input | $3.00 | $1.20 | per 1M input tokens |
| Output | $15.00 | $6.00 | per 1M output tokens |
| Cached input | $0.300 | $0.120 | per 1M cached input tokens |
| Cache write (5 min) | $3.75 | $1.50 | per 1M cache-write tokens, 5-minute |
| Cache write (1 hour) | $6.00 | $2.40 | per 1M cache-write tokens, 1-hour |
Discount. Charged rates include the current "Launch Promo" discount of 60% on every rate.
Specifications
- Model ID
claude-sonnet-4-5-20250929- Developer
- Anthropic
- Type
- Text
- Input
- Text, images and files
- Output
- Text
- Context window
- 200,000 tokens
- Max output
- 64,000 tokens
- Knowledge cutoff
- January 2025
- Released
- Sep 29, 2025
- Tokenizer
- Claude
- Series
- Claude 4.5
- Image input
- Up to 20 MB each
- File input
- Up to 100 MB each
- Endpoint
/v1/chat/completions- Status
- Deprecated (Sep 29, 2026)
Best for
Quickstart
Call claude-sonnet-4-5-20250929 with a POST to /v1/chat/completions on https://api.oxyy.ai, using your Oxyy API key from the OXYY_API_KEY environment variable. The same key works for every model in the catalog.
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.oxyy.ai/v1",
api_key=os.environ["OXYY_API_KEY"],
)
response = client.chat.completions.create(
model="claude-sonnet-4-5-20250929",
messages=[
{"role": "user", "content": "Explain unified AI APIs in one sentence."},
],
)
print(response.choices[0].message.content)Performance
Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better). Throughput and TTFT are measured on streaming requests, which are the only ones with a first-token moment to time.
Throughput
Latency
Time to first token
Cache hit rate
Availability
The share of requests to this model that completed successfully over the last 30 days. Requests the caller cancelled, and requests still in flight, are not counted. When an upstream provider errors, the gateway retries against another provider serving the same model, so a single provider incident does not necessarily show up here.
Days are UTC days. Days with no completed requests are omitted rather than drawn at 100% — no traffic is not evidence of availability.
Activity
Token volume and request traffic to this model over time. Daily totals, UTC.
Prompt tokens measure input size. Completion tokens reflect total output length. Reasoning is not priced separately for this model, so it is not itemised here.
Frequently asked questions
What is Claude Sonnet 4.5?
How much does Claude Sonnet 4.5 cost?
What is the context length of Claude Sonnet 4.5?
Does Claude Sonnet 4.5 support tool calling and structured outputs?
What inputs and outputs does Claude Sonnet 4.5 support?
Which API endpoint does Claude Sonnet 4.5 use?
What is the knowledge cutoff of Claude Sonnet 4.5?
When was Claude Sonnet 4.5 released?
What other models does Anthropic have?
Alternatives to Claude Sonnet 4.5
Models of the same kind from other vendors, closest in price first. Prices are pay-as-you-go on Oxyy, through the same API key.