Claude Opus 5
Thoughtful and proactive model matching Fable 5 intelligence at half the price
Context window
1M
Input / 1M tokens
$5.00
Output / 1M tokens
$25.00
Provider
Anthropic
Data verified 2026-07-25
Claude Opus 5 is Anthropic's latest flagship model for demanding reasoning, coding, and long-horizon agentic work. It delivers near-frontier intelligence at half the cost of Fable 5, with improved performance on coding and knowledge work benchmarks. The model features a 1M token context window, adaptive reasoning with effort levels, and is designed for everyday enterprise use.
Capability index
Relative estimates (0-100) to place this model against its peers, grounded in published benchmarks.
How to access it
Available on Claude.ai, Claude Platform, and Claude API. Accessible via web interface and API for all customers.
Strengths
- ✓coding and software engineering
- ✓knowledge work and research
- ✓long-context reasoning
- ✓agentic workflows
- ✓cost-efficiency relative to capabilities
Best for developers who...
When to choose it (and when not to)
Reach for Claude Opus 5 when...
- →When you need strong coding performance at reasonable cost
- →For long-context tasks with the 1M token window
- →When balancing capability with token efficiency
Look elsewhere if...
- ✕High-risk dual-use tasks like cybersecurity exploit generation
- ✕Workloads requiring Mythos/Fable 5 level frontier capabilities
How to use it
- ›Use effort parameter to trade cost for capability per request
- ›Leverage 1M context window for long documents and extended reasoning
- ›Extended thinking is on by default
Quickstart
Pythonfrom anthropic import Anthropic
client = Anthropic()
message = client.messages.create(
model="claude-opus-5",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello"}]
)
print(message.content)Available via Anthropic's Python SDK; requires API key
API model id: claude-opus-5
Benchmarks
| Benchmark | Score | Notes |
|---|---|---|
| Frontier-Bench | state-of-the-art | New state-of-the-art on coding and knowledge work evaluations |
| GDPval-AA | state-of-the-art | New state-of-the-art on coding and knowledge work evaluations |
Source: Anthropic Official Announcement
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