Claude Opus 4.5
Where it stands
Quality in independent tests against price, next to 135 other models. Up means more capable, left means cheaper.
About this model
Claude Opus 4.5 is an AI model from Anthropic, made available through the API on November 24, 2025. It can read up to 200,000 tokens in one request, roughly 375 pages of text, and write up to 64,000 tokens in a single answer. Besides text, it accepts files such as PDFs and images as input.
Through the API it costs $5 per million input tokens and $25 per million output tokens. It is among the more expensive models we track, a price usually reserved for the most capable, flagship-class models.
It supports extended reasoning: it can "think" step by step before answering, which helps on maths, code and complex questions. It can call tools and functions, so developers can connect it to search, databases or other software.
Quality scores
Rankings →- SWE-bench VerifiedCan the model fix real bugs in real open-source software projects? Share of tasks solved.76.7%#10 of 28
- GPQA DiamondVery hard multiple-choice questions in biology, physics and chemistry, written by PhD experts. Random guessing scores 25%.86.0%#48 of 116
- AIME mathCompetition-level math problems in the style of the American Invitational Mathematics Examination. Share solved.86.1%#55 of 112
- FrontierMathOriginal, unpublished math problems written by professional mathematicians, from advanced to research level. Share solved.34.4%#51 of 73
- SimpleQA VerifiedShort factual questions. Measures how often the model gets facts right instead of making something up.45.7%#32 of 69
Where to use it
Companies that serve this model through an API: 6. Prices per million tokens, cheapest first.
| Provider | Inputi | Outputi | Contexti | Uptime (24 h)i |
|---|---|---|---|---|
Claude Platform on AWSCheapest | $5 | $25 | 200K | 93.8% |
AzureCheapest | $5 | $25 | 200K | — |
GoogleCheapest | $5 | $25 | 200K | 99.9% |
Amazon BedrockCheapest | $5 | $25 | 200K | 100.0% |
AnthropicOfficialCheapest | $5 | $25 | 200K | 99.8% |
Amazon Bedrock | $5.50 | $27.50 | 200K | 100.0% |
Availability and prices come from OpenRouter’s public API and are refreshed daily. Uptime is the share of successful requests over the last 24 hours. Some providers run a compressed version of open models (fp8, int4), which is cheaper but can be slightly less accurate.
Use it in your code
Call Claude Opus 4.5 through OpenRouter’s OpenAI-compatible API: create a key on openrouter.ai, then run one of these examples.
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "anthropic/claude-opus-4.5", "messages": [{"role": "user", "content": "Hello! What can you do?"}]}'import os
from openai import OpenAI
client = OpenAI(base_url="https://openrouter.ai/api/v1", api_key=os.environ["OPENROUTER_API_KEY"])
reply = client.chat.completions.create(
model="anthropic/claude-opus-4.5",
messages=[{"role": "user", "content": "Hello! What can you do?"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://openrouter.ai/api/v1", apiKey: process.env.OPENROUTER_API_KEY });
const reply = await client.chat.completions.create({
model: "anthropic/claude-opus-4.5",
messages: [{ role: "user", content: "Hello! What can you do?" }],
});
console.log(reply.choices[0].message.content);The same code works with every model on this site: only the model ID changes. Many labs also offer their own API and SDK.
What it costs in practice
- 1,000 chat replies$10.00
- Summarise a 100-page document$0.275
- An app with 10,000 requests a day for a month$4,500
Similar-priced alternatives
| Model | Inputi | Outputi | Contexti | |
|---|---|---|---|---|
Fugu Ultra v2Sakana AI | $5 | $30 | 1M | Compare with ⇄ |
GPT Chat LatestOpenAI | $5 | $30 | 400K | Compare with ⇄ |
MiMo-V2.6-Pro-UltraSpeedXiaomi | $4.35 | $8.70 | 1M | Compare with ⇄ |
Qwen3.8 Max PrimeAlibaba Qwen | $4 | $12 | 1M | Compare with ⇄ |
Ember-1Fireworks AI | $3 | $15 | 1M | Compare with ⇄ |
Aion 3.5Aion Labs | $3 | $6 | 256K | Compare with ⇄ |
News about Anthropic
See all →Frequently asked questions
- How much does Claude Opus 4.5 cost?
- Claude Opus 4.5 costs $5 per million input tokens and $25 per million output tokens through the API. For example, 1,000 chat replies of about 500 tokens in and 300 out cost around $10.00.
- What is the context window of Claude Opus 4.5?
- Claude Opus 4.5 can read up to 200,000 tokens in one request, about 375 pages of text. It can write up to 64,000 tokens in a single answer.
- Is Claude Opus 4.5 open source?
- No. Claude Opus 4.5 is a closed model: its weights are not published, so you use it through Anthropic’s own apps and API, or through cloud providers.
- Who makes Claude Opus 4.5?
- Claude Opus 4.5 is made by Anthropic. It became available through the API on November 24, 2025.
- How good is Claude Opus 4.5?
- Claude Opus 4.5 has an overall index of 150.1 in Epoch AI’s independent tests, ranking #44 of 136 models we track.
- Can Claude Opus 4.5 read images?
- Yes. Besides text, it accepts files such as PDFs and images as input.
- What are the alternatives to Claude Opus 4.5?
- Models with a similar price from other companies include Fugu Ultra v2, GPT Chat Latest and MiMo-V2.6-Pro-UltraSpeed. You can compare them side by side on this page.