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
Weighted tokens formula
1× provider × 4× tier
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.
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)Weighted tokens
weighted_tokens = raw_tokens × 1 (provider) × 4 (tier)
Pro plan: 20M weighted tokens/month. Combined multiplier 4×: 5,000,000 raw tokens available.
Alternatives
Similar models in our catalog
Workloads that fit Claude Sonnet 4.5 (legacy) often fit these too. Compare benchmarks and pricing before locking in a default.