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claude-sonnet-4-5Anthropic

from /1M in$3.00anthropic pbc
context1M64K out
best ttft1.40sgoogle llc (vertex ai)
endpoints1210 regions
endpoints
12
regions
10
best tok/s
72
api
chat
released
September 2025
eu routing
available

capabilities 7/8

visionreasoningtoolscachingweb searchjson schemacomputer useimage gen

endpoints

12 / 10 regions
Providers serving claude-sonnet-4-5, with pricing and measured performance. Best value in each column is coloured.
#flags
1Anthropic PBCGlobal1M$3.00$15.00$0.301.63s54.0no-train
2AWS BedrockGlobal1M$3.00$15.00$0.301.75s72.0-zdr
3Google LLC (Vertex AI)Global1M$3.00$15.00$0.301.40s60.0-zdr
4AWS Bedrockeu-central-11M$3.30$16.50$0.301.75s72.0-zdr
5AWS Bedrockeu-north-11M$3.30$16.50$0.301.75s72.0-zdr
6AWS Bedrockeu-west-11M$3.30$16.50$0.301.75s72.0-zdr
7AWS Bedrockeu-west-31M$3.30$16.50$0.301.75s72.0-zdr
8AWS Bedrockus-east-11M$3.30$16.50$0.301.75s72.0-zdr
9AWS Bedrockus-east-21M$3.30$16.50$0.301.75s72.0-zdr
10AWS Bedrockus-west-21M$3.30$16.50$0.301.75s72.0-zdr
11Google LLC (Vertex AI)europe-west11M$3.30$16.50$0.331.40s60.0-zdr
12Google LLC (Vertex AI)us-east51M$3.30$16.50$0.331.40s60.0-zdr
provider price, no markupper 1M tokensblank where no qualifying sample

measured

through Sep 12
median
1.32s1.90s2.47s07-0608-0309-072.34s1.62s1.61s
hover the plot for weekly values
time to first token per provider: current value, window low and high, and change across the window
providernowlowhighchange
Google LLC (Vertex AI)1.40s1.42s2.38s+65%
Anthropic PBC1.63s1.54s1.91s-15%
AWS Bedrock1.75s1.59s2.09s-23%

median wait before the first token lands. this is the number a user feels, and it moves with provider load through the day.

Lines are steps: each sample is one week of traffic held flat, not a slide from the week before. Click a name in the key to drop it from the plot. Measured through Sep 12.

benchmarks

artificial analysis
Benchmark scores, each normalised to 100
evalScore as a share of 100/100
Math Index88.0
AIME 202588.0
MMLU Pro87.5
GPQA Diamond83.4
τ²-Bench78.1
LiveCodeBench71.4
Coding Index52.1
SciCode45.7
Terminal-Bench Hard35.6
Intelligence Index21.2
Humanity's Last Exam17.8
11 evalsmean60.8

Scores from Artificial Analysis and public leaderboards, normalised to 100. Bar colour is the band, not the rank: green 80 and up, blue 55 and up, amber 30 and up. Benchmarks measure narrow skills, so test on your own workload before committing. Released 2025-09-29.

call it

model=
claude-sonnet-4-5

requesty routes this id across every provider serving claude-sonnet-4-5, picking on price and health and failing over automatically. the id stays valid when a provider changes underneath it

Base url is https://router.requesty.ai/v1 for every id here. One key reaches the whole catalog.

quickstart

openai compatible
main.py
from openai import OpenAI client = OpenAI(    api_key="YOUR_REQUESTY_API_KEY",    base_url="https://router.requesty.ai/v1",) response = client.chat.completions.create(    model="claude-sonnet-4-5",    messages=[        {"role": "user", "content": "Explain quantum computing in one paragraph."},    ],) print(response.choices[0].message.content)

Change the base url, use your Requesty key, set the model to any id in the call pane. Existing OpenAI SDK code needs no other edit, and the same key reaches every other model in the catalog, so switching later is a one-parameter change. Browse all models

notes

reference

Claude Sonnet 4.5 is Anthropic's best coding model in the world, leading on SWE-bench Verified (77.2%) and OSWorld (61.4%). It delivers sustained autonomous performance on complex tasks for over 30 hours—up from seven hours for Opus 4—maintaining focus and reliability throughout the entire software development lifecycle, with enhanced capabilities in tool handling, memory management, and context processing that make it the strongest model for building complex agents.

questions 7

Which providers serve claude-sonnet-4-5?
claude-sonnet-4-5 is available from 3 providers through Requesty: Anthropic PBC, AWS Bedrock, Google LLC (Vertex AI). All endpoints share one OpenAI-compatible API and one key, and Requesty fails over between them automatically.
How much does claude-sonnet-4-5 cost?
Pricing starts at $3.00 per million input tokens and $15.00 per million output tokens on the cheapest provider. Prices vary by provider and region; the table above shows every endpoint. Requesty charges exactly what the upstream provider charges, with no markup.
Is claude-sonnet-4-5 open weights?
No. claude-sonnet-4-5 is a proprietary model from Anthropic, served through Anthropic's own API and licensed cloud platforms.
What is the context window of claude-sonnet-4-5?
claude-sonnet-4-5 supports up to 1M tokens of context, with up to 64K output tokens per response. Some providers expose a smaller window; check the per-endpoint context column above.
Which provider is fastest for claude-sonnet-4-5?
In recent production traffic through Requesty, Google LLC (Vertex AI) had the lowest median time to first token (1.40s) for claude-sonnet-4-5. Latency shifts over time, so Requesty's latency-based routing picks the fastest healthy provider per request automatically.
How do I use claude-sonnet-4-5 with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "claude-sonnet-4-5" or any endpoint id from the table above. The quickstart section shows Python, JavaScript and cURL snippets.
Should I call claude-sonnet-4-5 by its managed id or a provider id?
Use the managed id, "claude-sonnet-4-5". Requesty picks which of the 3 providers serves each request based on price and health, and fails over when one degrades, so the id keeps working while the routing changes underneath it. There is also an EU-only id, "claude-sonnet-4-5@eu", which routes the same way but only through EU-hosted providers. Send a provider id like "anthropic/claude-sonnet-4-5" only when you need one specific deployment and want no failover.

more from anthropic 6

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modelcontextfrom /Mproviders
claude-fable-5.11M$10.002
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claude-sonnet-51M$2.003
claude-fable-51M$10.003
claude-opus-4-81M$5.003
claude-opus-4-71M$5.003

route claude-sonnet-4-5 through one endpoint

One key for 3 providers on this model and 600+ others. No markup on provider prices, automatic failover, caching built in. Weekly aggregates in the measured pane come from production traffic routed through Requesty, one line per provider on a shared axis. Methodology

claude-sonnet-4-53 providers12 endpointsfrom $3.00 /1M inctx 1Mttft 1.40supdated Sep 12