Claude Sonnet 5.5

Anthropic's Claude Sonnet 5.5 for everyday coding, agentic tasks, and polished documents, faster than Sonnet 5 at the same price.

Input price: $2.20–$2.42
Output price: $11.00–$12.10

Context: 1M
Max output: 128K

Capability: 166 (#8 of 79)
Human preference: 1469
30-day uptime: —

Released: 2026-09-28
Knowledge cutoff: 2026-06

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Providers

Providers that serve this model. With Auto, each request goes to the best available provider. Prices in USD per 1M tokens; stats cover the last 30 days.

AutoInput$2.20–$2.42Output$11.00–$12.10Cache read$0.11–$0.121Context1MMax output128KWe send each request to the best-priced healthy provider. You pay that provider’s price.AnthropicInput$2.20Output$11.00Cache read$0.11United StatesNo trainingNo retentionAnthropic (AWS)Input$2.20Output$11.00Cache read$0.11United StatesAmazon BedrockInput$2.42Output$12.10Cache read$0.121Context1MMax output128KUnited StatesNo trainingNo retention

Pricing

Prices vary by provider. Showing Anthropic, the lowest. Pick a provider above to see its prices.

Input: $2.20; per 1M tokens
Output: $11.00; per 1M tokens
Cache read: $0.11; per 1M tokens
Cache write (5 min): $2.75; per 1M tokens
Cache write (1 hour): $4.40; per 1M tokens
Batch input: $1.10; per 1M tokens
Batch output: $5.50; per 1M tokens
Web search: $0.011; per request

Try it

Runs on your balance and is billed like any API request.

curl https://api.ohmygpt.com/v1/messages \
  -H "x-api-key: $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "anthropic/claude-sonnet-5-5",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'

import os

from anthropic import Anthropic

client = Anthropic(
    api_key=os.environ["OHMYGPT_API_KEY"],
    base_url="https://api.ohmygpt.com",
)

message = client.messages.create(
    model="anthropic/claude-sonnet-5-5",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(message.content[0].text)

import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  apiKey: process.env.OHMYGPT_API_KEY,
  baseURL: "https://api.ohmygpt.com",
});

const message = await client.messages.create({
  model: "anthropic/claude-sonnet-5-5",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});
for (const block of message.content) {
  if (block.type === "text") console.log(block.text);
}

The answer streams in here.

Billed by usage

Similar models

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Better value: more capable, lower price
Pareto frontier
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Capability scores are from Epoch AI’s Epoch Capabilities Index (CC BY 4.0, as of 2026-11-10), which combines dozens of benchmarks with GPT-5 set at 150. epoch.ai/eci

Price: our current input price per 1M tokens in USD, lowest across channels. Dated snapshots and resold copies of the same model are merged into one point; free models are not shown.

Shaded area: capability above and price below the median of all models. Pareto frontier: no other model is both cheaper and more capable.

Claude Sonnet 5.5This model

Capability: 166
Input: $2.20–$2.42
Output: $11.00–$12.10

Claude Sonnet 5

Capability: 157
Input: $2.20–$2.42
Output: $11.00–$12.10

Grok 4.5

Capability: 155
Input: $2.20
Output: $6.60

GPT-5.4

Capability: 158
Input: $2.25–$4.50
Output: $13.50–$20.25

Kimi K3.1 Pro

Capability: 162
Input: $2.0878
Output: $10.9208

Human preference ratings are from the LMArena Text Arena (CC BY 4.0, as of 2026-11-09): Elo ratings from blind votes, on a different scale from capability scores. lmarena.ai/leaderboard/text