Claude Opus 4.5
Vendor keyClaude Opus 4.5 is a legacy model in Anthropic's Opus family, released November 24, 2025. It uses manual extended thinking rather than the adaptive thinking of later Opus models. Claude Opus 5 is the current Opus model, and Anthropic recommends migrating to it for improved performance.
The real Anthropic model
Same weights, same API, same answers. We change only how you pay for it: one key for every maker, one bill, no separate account to open. Every figure on this page comes from Anthropic’s own page — check it.
Maker's own pagePrice
per 1M tokens
Input
Output
$5.00
$25.00
Context
200,000
up to 64,000 out
Modalities
Released
Nov 24, 2025
Knows up to Aug 2025
What it would cost you
1000 tokens is roughly 750 English words.
Where this model runs
Similar models
Models built for the same kind of work, at a similar price.
We do not mark up the price of tokens. It is the same price the provider charges. We earn on the top-up fee.
Use it from your code
from openai import OpenAI
# Works with the official openai package (pip install openai)
client = OpenAI(
base_url="https://api.flintbeam.com/v1",
api_key="sk-live-your-api-key"
)
response = client.chat.completions.create(
model="anthropic/claude-opus-4.5",
messages=[
{"role": "system", "content": "You are an experienced software engineer."},
{"role": "user", "content": "Describe the architecture of a distributed cache."}
],
temperature=0.7,
max_tokens=1500
)
print(response.choices[0].message.content)