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Anthropic: Claude Sonnet 4.5

anthropic/claude-sonnet-4-5-20250929
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Legacy Sonnet model with a 200K token context window and extended thinking.
ModalitiesTextImageFileText
In / out price$1.20 / $6.00 per 1M
Context200K
ReleasedSep 29, 2025
ProvidersPricingPerformanceAvailabilityAppsActivityFAQExplore

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.

ProviderInput /MOutput /MCache read /MLatencyThroughput
Anthropic$1.20$6.00$0.3003.41s126 tps

Capabilities (16)

StreamingTool callingParallel tool callsStructured outputThinkingReasoningSystem promptVisionPDF inputMultilingualPrompt cachingBatchWeb searchWeb FetchCode executionComputer use

Supported parameters (6)

max_tokenstemperaturetop_ptop_ktoolsresponse_format

Any other parameter you send is ignored rather than rejected.

Pricing

What this model costs to run, next to the rate it is posted at. Caching and discounts mean the price actually paid is often below the listed one.

Effective input price
$1.20
/M tokens · listed $3.00
Effective output price
$6.00
/M tokens · listed $15.00
RateListedChargedUnit
Input$3.00$1.20per 1M tokens
Output$15.00$6.00per 1M tokens
Cache read$0.300$0.300per 1M tokens
Cache write$3.75$3.75per 1M tokens
Cache write (1h)$6.00$6.00per 1M tokens
UTC

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
126tok/s
P50, streaming requests
Latency
3.41s
P50, end to end
UTC

Throughput

P991453 tok/s
P95694 tok/s
P50125 tok/s

Latency

P506408ms
P7517.9s
P9530.5s
P9943.0s

Time to first token

P501175ms
P951701ms

Cache hit rate

54.21%
Share of input tokens served from the prompt cache over the window.

Availability

The share of requests to this model that completed successfully. 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.

Success rate (30d)
65.00%
over 303 requests
Days with traffic
4
of the last 30

Days are UTC days. Days with no requests are omitted rather than drawn at 100% — no traffic is not evidence of availability.

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

  1. 1.Oxyy Tester71.0K tokens

Activity

Token volume and request traffic to this model over time. Daily totals, UTC.

Prompt737.5K
Reasoning3.9K
Completion55.6K

Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.

Frequently asked questions

What is Claude Sonnet 4.5?
Legacy Sonnet model with a 200K token context window and extended thinking.
How much does Claude Sonnet 4.5 cost?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens. Cached prompt tokens are billed at $0.300 per million. You pay per request, with no subscription.
What is the context length of Claude Sonnet 4.5?
Claude Sonnet 4.5 has a context window of 200,000 tokens, and can return up to 64,000 tokens in one response.
Does Claude Sonnet 4.5 support tool calling and structured outputs?
Yes — Claude Sonnet 4.5 supports both tool calling and structured outputs.
What inputs and outputs does Claude Sonnet 4.5 support?
Claude Sonnet 4.5 accepts text, image, file as input and returns text.
What other models does Anthropic have?
Anthropic also offers Claude Fable 5, Claude Fable 5.1, Claude Haiku 4.5, Claude Opus 4.5 through Oxyy.
When was Claude Sonnet 4.5 released?
Claude Sonnet 4.5 was released on Sep 29, 2025.

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