Is claude-sonnet-5-5 cheaper than claude-sonnet-4-20250514?

A full price comparison is not published. One or both prices are missing from the official pages we checked.

Does claude-sonnet-5-5 have a bigger context window than claude-sonnet-4-20250514?

Context window sizes are not both published on the official pages we checked.

claude-sonnet-4-20250514 to claude-sonnet-5-5: price, context, and code

The official replacement is claude-sonnet-5-5. claude-sonnet-4-20250514 shut down on 2026-06-15 per Anthropic's deprecation page (checked 2026-10-17). Price, context window, and max output were left blank because the official pages we checked did not publish them.

claude-sonnet-4-20250514 to claude-sonnet-5-5

Some values not published Checked 2026-10-17.

Price per 1M tokens

Price comparison. Example monthly cost for 10M input tokens and 2M output tokens. Labeled example, not a bill.
Field	Old	New	Change
Input	Not published	$2	Not published
Output	Not published	$10	Not published
Cached input	Not published	$0.1	Not published
Example monthly cost	Not published	$40	Example only

Context and max output

Token limits
Limit	Old	New	Change
Context window	Not published	1,000,000	Not published
Max output	Not published	128,000	Not published

Capabilities that differ

No differing capability values are published for both models.

API changes

No parameter change is listed on the official pages we checked. The sample below only swaps the model id.

Code

python typescript curl

python before

import anthropic
client = anthropic.Anthropic()
message = client.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)

python after

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

typescript before

import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic();
const message = await client.messages.create({
  model: "claude-sonnet-4-20250514",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

typescript after

import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic();
const message = await client.messages.create({
  model: "claude-sonnet-5-5",
  max_tokens: 1024,
  messages: [{ role: "user", content: "Hello" }],
});

curl before

curl https://api.anthropic.com/v1/messages \
  -H "x-api-key: $ANTHROPIC_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{"model":"claude-sonnet-4-20250514","max_tokens":1024,"messages":[{"role":"user","content":"Hello"}]}'

curl after

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

Checklist

Read the shutdown date for claude-sonnet-4-20250514 on the linked official page.
Point your requests at claude-sonnet-5-5.
Re-check price, context, and parameters on the provider pages linked here.
Ship the change before the published shutdown date.

Replacement for claude-sonnet-4-20250514: what changes when you switch