Anthropic
Makers of Claude — safety-focused AI research lab
ReasoningLong contextSafetyCodingAnthropic Messages API
About Anthropic
Anthropic develops the Claude model family, known for strong reasoning, careful instruction following, and long-context capabilities. Claude Opus leads on complex analysis, while Sonnet and Haiku offer excellent quality at lower price points. Antbase routes to the optimal Claude variant automatically — Opus for hard problems, Sonnet for everyday tasks, Haiku for speed.
Key Models
Claude Opus 4Claude Sonnet 4Claude Haiku 4.5
Live Performance Data
Anthropic Models on Antbase
| Model | Score | Requests | Success Rate | Avg Latency | p95 Latency | Capabilities |
|---|---|---|---|---|---|---|
| Claude Sonnet 4 | 92.0 | 0 | 0.0% | 1000ms | 2500ms | 👁🧠🔧 |
| Claude 3.5 Sonnet | 88.0 | 0 | 0.0% | 1000ms | 2500ms | 👁🔧 |
| Claude 3.5 Haiku | 72.0 | 0 | 0.0% | 600ms | 1500ms | 👁🔧 |
| anthropic/claude-opus-4-6 | 61.0 | 1 | 10000.0% | 2033ms | 2033ms | |
| anthropic/claude-fable-5@anthropic | 47.0 | 4 | 10000.0% | 8063ms | 18505ms | |
| anthropic/claude-fable-5-latest | 34.0 | 1 | 0.0% | 566ms | 566ms | |
| anthropic/claude-fable-5:free | 34.0 | 1 | 0.0% | 855ms | 855ms | |
| anthropic/claude-3-5-sonnet-20241022 | 32.0 | 1 | 0.0% | 1413ms | 1413ms | |
| anthropic/claude-opus-4-7 | 26.0 | 1 | 0.0% | 4572ms | 4572ms | |
| anthropic/claude-opus-4-8 | 16.0 | 1 | 0.0% | 15720ms | 15720ms |
How to Use Anthropic on Antbase
All Anthropic models are available through Antbase's unified OpenAI-compatible API. You can either route directly to a specific Anthropic model or let ANT's intelligent router automatically select the best model for your task.
python
from openai import OpenAI
client = OpenAI(
base_url="https://antbase.ai/v1",
api_key="your-ant-api-key",
)
# Let ANT auto-route (may use Anthropic if optimal)
response = client.chat.completions.create(
model="ant:auto",
messages=[{"role": "user", "content": "Hello!"}],
)
# Or route directly to a Anthropic model
response = client.chat.completions.create(
model="anthropic/claude-opus-4",
messages=[{"role": "user", "content": "Hello!"}],
)Why Use Anthropic Through Antbase?
- •No separate account needed — access Anthropic models instantly through your Antbase API key.
- •Intelligent routing — ANT automatically selects the best Anthropic model for each task, or falls over to another provider if Anthropic is slow or down.
- •Same token prices — Antbase charges zero markup on Anthropic token prices. You pay exactly what Anthropic charges.
- •Automatic failover — if Anthropic has an outage, your requests seamlessly route to an equivalent model on another provider.