How much does Claude Sonnet 5.5 cost?

On the Respan gateway, Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens on every provider, after gateway discounts.

Which providers serve Claude Sonnet 5.5 on Respan?

Claude Sonnet 5.5 is available through 5 providers: Anthropic, DeepInfra, OpenRouter, Perplexity, and Google Vertex AI. Perplexity and Google Vertex AI require your own provider API key (BYOK).

What is Claude Sonnet 5.5's context window?

Claude Sonnet 5.5 accepts up to 1M tokens of context on its largest provider route.

How do I use Claude Sonnet 5.5 with the Respan gateway?

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "anthropic/claude-sonnet-5-5". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

How fast is Claude Sonnet 5.5?

Over the last 30 days of requests through the Respan gateway, the fastest provider was Anthropic at 7 tokens per second, and the lowest response latency was 1.0 seconds on Anthropic. Speed varies with request size and provider.

Where does Claude Sonnet 5.5 rank on the Respan Index?

Claude Sonnet 5.5 scores 68.5 out of 100 on the Respan Index v1.1, ranking #6 of 138 models. By category: Coding 70.1, Agents 78.1, Reasoning 70.7, Knowledge & language 48.4, and Human preference 59.5. The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

How does Claude Sonnet 5.5 score on benchmarks?

Claude Sonnet 5.5 has 29 published benchmark scores, including LiveBench Coding 91.4%, OSWorld 2.1 (partial) 80.1%, and GPQA Diamond 95.6%. Each score links to where it was published; the data is collected by llmmetric.com.

DemoBook a demo Dashboard

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Agent setup

Paste into Claude Code, Cursor, or Codex

Copy for agentRead docs

Providers

Claude Sonnet 5.5 API: Pricing, Benchmarks & Context Window | Respan

Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's model offering the best combination of speed and intelligence, with a 1M-token context window, 128K max output, and adaptive thinking.

Input / output price: $2.00 / $10.00 per 1M
Context: 1M tokens
Released: Sep 28, 2026

Try Respan for free

Agent setup

Paste into Claude Code, Cursor, or Codex

Help me set up the Respan gateway: fetch and follow https://www.respan.ai/docs/agent-setup.md. Use model "anthropic/claude-sonnet-5-5".

from openai import OpenAI

client = OpenAI(

    base_url="https://api.respan.ai/api/",

    api_key="YOUR_RESPAN_API_KEY",

)

response = client.chat.completions.create(

    model="anthropic/claude-sonnet-5-5",

    messages=[{"role": "user", "content": "Hello!"}],

)

print(response.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({

  baseURL: "https://api.respan.ai/api/",

  apiKey: "YOUR_RESPAN_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);

curl https://api.respan.ai/api/chat/completions \

  -H "Authorization: Bearer YOUR_RESPAN_API_KEY" \

  -H "Content-Type: application/json" \

  -d '{

    "model": "anthropic/claude-sonnet-5-5",

    "messages": [{"role": "user", "content": "Hello!"}]

}'

Read docs

Providers

5 providers, cheapest first, priced per 1M tokens after gateway discounts. BYOK routes use your own key.

Provider	Context	Input	Output	Cache read
Anthropic`anthropic/claude-sonnet-5-5`	1M	$2.00/M	$10.00/M	$0.20/M
DeepInfra`deepinfra/anthropic/claude-sonnet-5-5`	1M	$2.00/M	$10.00/M	$0.00/M
OpenRouter`openrouter/anthropic/claude-sonnet-5.5`	1M	$2.00/M	$10.00/M	$0.10/M
PerplexityBYOK only`perplexity/anthropic/claude-sonnet-5-5`	1M	$2.00/M	$10.00/M	$0.20/M
Google Vertex AIBYOK only`vertex_ai/claude-sonnet-5-5@default`	1M	$2.00/M	$10.00/M	$0.20/M

Is a provider down? Anthropic status, OpenRouter status, Perplexity status, Google AI status

Pricing

Averaged across 5 providers, in USD per 1M tokens after gateway discounts.

Average input: $2.00 per 1M
Average output: $10.00 per 1M
Average cache read: $0.14 per 1M
Average cache write: $2.00 per 1M

Cost by volume

Total cost from 0 to 1T tokens.

$2.00/MAnthropic, DeepInfra, OpenRouter, Perplexity, and Google Vertex AI

Throughput and latency

30-day averages from requests through the Respan gateway, 1 of 5 routes had traffic in that window. Under each figure, every model on the gateway by its average, this one in blue.

Certified where it counts.

Built to meet the security and privacy standards that enterprise and healthcare teams require.

Benchmarks

The Respan Index plus 29 published scores from 8 sources, each linked to where it was published.

68.5/ 100

Respan Index#6 of 138

138 ranked models. The shaded band is this model's 95% interval, 63.5 to 72.9. Claude Fable 5.1 and Claude Opus 5 fall inside it, so the gap is within the margin of error.

Published scores

Benchmark	Score	Source	Published
LiveBench CodingLiveBench	91.4%	LiveBench	Oct 5, 2026
Terminal-Bench 4.0Anthropic	70.6%	Anthropic	Sep 28, 2026
Terminal-Bench 4.0Vals AI	64.1%	Vals AI	Oct 5, 2026
FrontierSWE V2Proximal Labs	61.9%	Proximal Labs	Oct 5, 2026
CursorBench 4.0Anthropic	55.5%	Anthropic	Sep 28, 2026
FrontierCode v1.1 (Main)Anthropic	46.2%	Anthropic	Sep 28, 2026

Benchmark	Score	Source	Published
OSWorld 2.1 (partial)Anthropic	80.1%	Anthropic	Sep 28, 2026
APEX-AgentsMercor	75.5%	Mercor	Oct 5, 2026
LiveBench Agentic CodingLiveBench	56.3%	LiveBench	Oct 5, 2026

Benchmark	Score	Source	Published
GPQA DiamondEpoch AI	95.6%	Epoch AI	Oct 5, 2026
LiveBench ReasoningLiveBench	91.6%	LiveBench	Oct 5, 2026
LiveBench Data AnalysisLiveBench	78.6%	LiveBench	Oct 5, 2026
SimpleBenchSimpleBench	75.9%	SimpleBench	Oct 1, 2026
Mystery Game PuzzlesEpoch AI	65%	Epoch AI	Oct 5, 2026
Humanity's Last Exam (with tools)Anthropic	64.5%	Anthropic	Sep 28, 2026

Benchmark	Score	Source	Published
OTIS Mock AIME 2024-2025Epoch AI	100%	Epoch AI	Oct 5, 2026
LiveBench MathematicsLiveBench	96.7%	LiveBench	Oct 5, 2026
FrontierMath Tiers 1-3 v2Epoch AI	88.8%	Epoch AI	Oct 5, 2026
FrontierMath Tier 4 v2Epoch AI	80.5%	Epoch AI	Oct 5, 2026

Benchmark	Score	Source	Published
LiveBench LanguageLiveBench	83.4%	LiveBench	Oct 5, 2026
LiveBench Instruction FollowingLiveBench	70.5%	LiveBench	Oct 5, 2026
SimpleQA VerifiedEpoch AI	46.5%	Epoch AI	Oct 5, 2026

Benchmark	Score	Source	Published
Furniture AssemblyEpoch AI	75%	Epoch AI	Oct 5, 2026
Chartography (no tools)Anthropic	61.6%	Anthropic	Sep 28, 2026

Benchmark	Score	Source	Published
LMArena WebDevLMArena	1786 Elo · #3 of 94	LMArena	Oct 1, 2026
LMArena EloLMArena	1471 Elo · #33 of 141	LMArena	Oct 2, 2026
LMArena VisionLMArena	1268 Elo · #26 of 77	LMArena	Oct 2, 2026
LMArena AgentLMArena	0.1252 · #3 of 48	LMArena	Oct 2, 2026

Benchmark	Score	Source	Published
SAGEVals AI	51.8%	Vals AI	Oct 5, 2026

How the Respan Index works

How Claude compares: Claude vs Gemini, Claude vs Grok, Claude vs GPT

Providers

Providers

Claude Sonnet 5.5

Providers

Pricing

Cost by volume

Throughput and latency

Certified where it counts.

Output speed

Time to first token

Response latency

Benchmarks

Respan Index#6 of 138

Published scores

Apps

Claude Sonnet 5.5 FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Providers

Providers

Claude Sonnet 5.5

Providers

Pricing

Cost by volume

Throughput and latency

Certified where it counts.

Output speed

Time to first token

Response latency

Benchmarks

Respan Index#6 of 138

Published scores

Apps

Claude Sonnet 5.5 FAQ

What is Claude Sonnet 5.5?

How much does Claude Sonnet 5.5 cost?

Which providers serve Claude Sonnet 5.5 on Respan?

What is Claude Sonnet 5.5's context window?

How do I use Claude Sonnet 5.5 with the Respan gateway?

How fast is Claude Sonnet 5.5?

Where does Claude Sonnet 5.5 rank on the Respan Index?

How does Claude Sonnet 5.5 score on benchmarks?

Works with your entire stack

Built for AI agents. Break less. Ship more.

Built for AI agents.
Break less.
Ship more.