Claude Sonnet 5.5 API Pricing & Quick Start

Intelligence	Speed	Input Price	Output Price	First-token latency
#2 / 687 56 Artificial Analysis Intelligence Index	#100 / 356 129.1 Output tokens per second (median)	#343 / 466 $2.00NT$ 64 USD / 1M tokens	#344 / 466 $10.00NT$ 319 USD / 1M tokens	#355 / 356 460.74s Time to first token (AA median)

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...

Provider	Anthropic
Released	September 2026
Model ID	`anthropic/claude-sonnet-5.5`

Technical specifications

Context window

1M tokens

Reasoning

—

Input → Output

TextImageFileText

Pricing comparison

BazaarLink retail price alongside AA's observed market standard.

BazaarLink price our site

Input$2.00NT$ 64

Output$10.00NT$ 319

Cache read$0.20NT$ 6

Cache write$2.50NT$ 80

3:1 blended (est.)$4.00NT$ 127

All prices per 1M tokens. Supports TWD credit card / official invoice.

Market reference Artificial Analysis

Input$2.00

Output$10.00

Cache readAA not tracked

Cache writeAA not tracked

3:1 blended—

✓ Matches market reference — BazaarLink does not mark up.
Source: artificialanalysis.ai

Independent benchmarks

Scores below come from Artificial Analysis, an independent third party. BazaarLink does not participate in the testing.

Intelligence 56

Coding

Math

MMLU

GPQA

This modelCategory leader

Overall intelligence

🥈

#2out of 687 models

Aggregated across academic benchmarks

Time to first token

#355out of 356 models

AA 全球 p50：460.74 秒

Intelligence

Top 1%

This model

Category leader

Median

Scores by reasoning effort (this page uses the default effort)

Reasoning effort	Intelligence	Coding
max · shown on this page	56.0	—
xhigh	51.9	—
high	46.8	—
medium	40.8	—
low	35.9	—

Top 5 — CodingCoding Index leaderboard

1Claude Fable 5.1 (Max, Default Fallback)?/claude-fable-5-182$10 / $50

2Claude Fable 5.1 (Xhigh, Default Fallback)?/claude-fable-5-1-xhigh81$10 / $50

3Claude Fable 5.1 (High, Default Fallback)?/claude-fable-5-1-high79$10 / $50

4GPT-5.6 Sol (Xhigh)openai/gpt-5-6-sol-xhigh78$4 / $20

5Claude Opus 5 (Max)anthropic/claude-opus-578$5 / $25

AASource: Artificial Analysis · Independent third-party evaluation; not influenced by BazaarLinkView full evaluation on AA →

Quick Start

Use Claude Sonnet 5.5 via BazaarLink API — just change the base_url:

Python

from openai import OpenAI

client = OpenAI(
    base_url="https://api.bazaarlink.ai/v1",
    api_key="sk-bl-YOUR_API_KEY",
)

response = client.chat.completions.create(
    model="anthropic/claude-sonnet-5.5",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)

TypeScript

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.bazaarlink.ai/v1",
  apiKey: "sk-bl-YOUR_API_KEY",
});

const response = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-5.5",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);

Why use Claude Sonnet 5.5 via BazaarLink?

✓Clear usage records and itemized billing
✓OpenAI-compatible API — zero code changes required
✓When an upstream source has a problem, a request can try another available source. If none is available, the request returns an error.
✓Support resources for teams

Try Now ← All Models

Frequently Asked Questions

What is Claude Sonnet 5.5?

How much does the Claude Sonnet 5.5 API cost?

Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens when accessed through BazaarLink.

How do I use Claude Sonnet 5.5 with the OpenAI SDK?

Set base_url to "https://api.bazaarlink.ai/v1" and use model ID "anthropic/claude-sonnet-5.5". All OpenAI SDK methods (chat.completions, embeddings, streaming) work without code changes.

What is the context window for Claude Sonnet 5.5?

Claude Sonnet 5.5 supports a context window of 1,000,000 tokens.

Is Claude Sonnet 5.5 available for free?

Claude Sonnet 5.5 is a paid model. BazaarLink offers free trial credits on registration so you can test it without a credit card.

Relay integrity checks

Tested endpoints: 315 runs
Independent hosts: 114
Model-family fingerprint match: 86%
Anomalies detected: 258 runs
Data range: past 90 days

BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.

View the full integrity report →