Anthropic: Claude Sonnet 5.5

2 providers live

anthropic/claude-sonnet-5.5

→

2 live providers
100% uptime
2.98 s first token
997 tok/s output

Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing polished documents, slides, and spreadsheets, and it writes and communicates more clearly than its predecessor. Thinking is always on, so effort is the main lever for trading off depth, latency, and cost, and lower effort settings keep it responsive for everyday agentic loops.

Context: 1M; tokens
Max output: 128K; tokens
Input: $2.00; per million tokens
Output: $10.00; per million tokens

Providers

Ranked by price and speed. Requests go to the best healthy provider, then fail over down the list.Benchmarks

Live providers of Claude Sonnet 5.5, in the router's order
Who answers now	Input per 1M	First token
llm.buzzpicked	$2.00	7.41 s
Anthropic	$2.00	2.98 s

llm.buzz answers now: first in the router's order.

First token is the 24-hour median. If the pick fails, the next one answers at its own price.

#	Provider	Input	Output	Cache read	Latency	Throughput	Uptime (3d)
1	llm.buzzAutoNon-EU Data policy not declared	$2.00	$10.00	$0.10	7.41 s	134 tok/s	97.1%
2	AnthropicNon-EU Data policy not declared	$2.00	$10.00	$0.10	2.98 s	997 tok/s	100%

Want to serve this model?Become a provider

Price history

No price changes since Oct 22, 2026.

Anthropic$2.00 in, $10.00 out

Performance

Last 24 hours, from llm.buzz's test requests

Throughput (tok/s)

llm.buzz134 tok/s
Anthropic997 tok/s

Data table

Provider	From (UTC)	p50	p90	p99
llm.buzz	Oct 26, 06:00	134 tok/s	134 tok/s	134 tok/s
llm.buzz	Oct 26, 10:00	161 tok/s	161 tok/s	161 tok/s
llm.buzz	Oct 26, 19:00	112 tok/s	112 tok/s	112 tok/s
llm.buzz	Oct 27, 00:00	93 tok/s	93 tok/s	93 tok/s
llm.buzz	Last 24 hours	134 tok/s	93 tok/s	93 tok/s
Anthropic	Oct 26, 05:00	1196 tok/s	1196 tok/s	1196 tok/s
Anthropic	Oct 26, 20:00	997 tok/s	997 tok/s	997 tok/s
Anthropic	Oct 27, 01:00	997 tok/s	997 tok/s	997 tok/s
Anthropic	Last 24 hours	997 tok/s	997 tok/s	997 tok/s

Latency (time to first token)

llm.buzz7.41 s
Anthropic2.98 s

Data table

Provider	From (UTC)	p50	p90	p99
llm.buzz	Oct 26, 06:00	3.57 s	3.57 s	3.57 s
llm.buzz	Oct 26, 10:00	10.7 s	10.7 s	10.7 s
llm.buzz	Oct 26, 14:00	45.9 s	45.9 s	45.9 s
llm.buzz	Oct 26, 19:00	7.41 s	7.41 s	7.41 s
llm.buzz	Oct 27, 00:00	2.48 s	2.48 s	2.48 s
llm.buzz	Last 24 hours	7.41 s	45.9 s	45.9 s
Anthropic	Oct 26, 05:00	2.98 s	2.98 s	2.98 s
Anthropic	Oct 26, 10:00	2.98 s	2.98 s	2.98 s
Anthropic	Oct 26, 15:00	3.57 s	3.57 s	3.57 s
Anthropic	Oct 26, 20:00	2.98 s	2.98 s	2.98 s
Anthropic	Oct 27, 01:00	6.17 s	6.17 s	6.17 s
Anthropic	Last 24 hours	2.98 s	6.17 s	6.17 s

Uptime

Last 72 hours, by hour

Best provider 100%

This model

llm.buzz

Anthropic

Up: 95% or more served
Degraded: 85% to 95%
Down: below 85%
No data
From llm.buzz's test requests

Questions

How much does Anthropic: Claude Sonnet 5.5 cost?

Anthropic: Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens at llm.buzz, the provider requests go to first, with cache reads at $0.10 per million tokens.

Do providers train on my prompts?

Each provider declares it, and the table above shows every declaration. You can limit a request to providers that keep nothing, or to providers in the EU.

Can I serve Anthropic: Claude Sonnet 5.5 myself?

Yes. Apply as a provider, add your endpoint and list this model at your price. It goes live once the automated check passes.

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Call it

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.llm.buzz/api/v1",
    api_key=os.environ["LLM_BUZZ_KEY"],
)
reply = client.chat.completions.create(
    model="anthropic/claude-sonnet-5.5",
    messages=[{"role": "user", "content": "Hello"}],
)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.llm.buzz/api/v1",
  apiKey: process.env.LLM_BUZZ_KEY,
});
const reply = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-5.5",
  messages: [{ role: "user", content: "Hello" }],
});

curl https://api.llm.buzz/api/v1/chat/completions \
  -H "Authorization: Bearer $LLM_BUZZ_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-sonnet-5.5",
       "messages": [{"role": "user", "content": "Hello"}]}'

Endpoints

POST /api/v1/chat/completionsPOST /api/v1/responsesPOST /api/v1/messages

Authentication

Send your llm.buzz key as a Bearer token: Authorization: Bearer $LLM_BUZZ_KEY. Create keys in the console. The same key calls every model; each request pays the price of the provider that answered it.

More in Authentication and the API reference.

Call Anthropic: Claude Sonnet 5.5 with one keyEach request pays the price of the provider that answered it.

Get API key