Anthropic
Claude Sonnet 4.5 (legacy)
model
claude-sonnet-4-5MidStableVisionStreamingVisionToolsBatchLong contextUnited States
Context
200K
Input / 1M tokens
$3.00
Output / 1M tokens
$15.00
Cached input / 1M tokens
$0.7050
Cache write / 1M tokens
$3.75
About this model
Claude Sonnet 4.5 (legacy)
Claude Sonnet 4.5 — previous-generation Sonnet. Use this for version pinning when auto-following Sonnet upgrades is not desired.
Key facts
- Maker
- Anthropic
- Context window
- 200K tokens
- Max output
- 64K tokens
- Lane
- Guarded: the provider has confirmed it does not train on your data
- Modality
- Text and image input
- Input price
- $3.00 per 1M tokens
- Output price
- $15.00 per 1M tokens
- Processing region(s)
- us
- Route
- Via Anthropic's API
- Cheapest plan
- Available from the Pro plan
- Price comparison
- Priced below 27 of 255 pro-band guarded models on Anoman (blended price: 1 part input to 3 parts output).
Released
2024-10
Training cutoff
2024-09
Parameters
Not disclosed
Best for
Use cases
- Production deployments pinned to a Sonnet version
Strengths
What it does well
- Stable across upgrades
- Same workhorse quality as 4.6 for most tasks
Limitations
Know the trade-offs
- Slightly weaker on hard tasks vs 4.6
Code example
Chat completion with Claude Sonnet 4.5 (legacy)
from openai import OpenAI
client = OpenAI(
base_url="https://api.anoman.io/v1",
api_key="anm-sk-..."
)
response = client.chat.completions.create(
model="claude-sonnet-4-5",
messages=[{"role": "user", "content": "Hello!"}]
)
print(response.choices[0].message.content)Alternatives
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