Claude Opus 5
Overview
Claude Opus 5 is an Anthropic model designed for complex agentic coding, long-running workflows, and professional knowledge work. On B.AI, use the model ID claude-opus-5.
Key Features
- Adaptive Thinking: Supports
effortcontrols (low,medium,high,xhigh, andmax) to balance reasoning depth, latency, and token usage. - Long Context: Supports up to 1,000,000 tokens of context and up to 128,000 output tokens for long documents, codebases, and multi-step workflows.
- Multimodal Understanding: Supports text and image input with text output for document, chart, diagram, and interface analysis.
- Tool-Using Workflows: Supports function calling and structured output. Additional tool availability depends on the B.AI API configuration.
- Prompt Caching: Supports 5-minute and 1-hour cache-write pricing tiers for eligible prompts.
Best Use Cases
- Agentic Software Engineering: Repository-scale implementation, debugging, refactoring, code review, and test-fix-verify workflows.
- Long-Running Automation: Multi-step tasks that combine planning, tool calls, intermediate validation, and recovery from failures.
- Professional Knowledge Work: Research synthesis, document analysis, structured extraction, and generation of professional deliverables.
- Long-Context Analysis: Large codebases, long documents, PDFs, charts, diagrams, and other visual references.
Capabilities and Limitations
| Capability | Description |
|---|---|
| Reasoning | Supports adaptive thinking with configurable effort levels. Higher effort can increase reasoning depth, latency, and token usage. |
| Creative Writing | Supports general text generation, long-form writing, and professional document drafting. |
| Multimodal | Text and image input; text output. |
| Response Speed | Response time depends on prompt complexity, output length, and the selected reasoning effort. |
| Context Window | Up to 1,000,000 tokens. |
| Max Output | Up to 128,000 tokens. |
| Tool Use | Function calling and structured output are supported. Other tools depend on the B.AI API configuration. |
| Multilingual | Suitable for multilingual natural-language and developer workflows. |
Known Limitations
- Very long contexts, large outputs, and higher reasoning effort can increase latency and Credits usage.
- Confirm tool availability and request parameters in a test environment before deploying a new workflow to production.
- Cache behavior and eligibility depend on the request format and platform configuration.
Credits Usage
| Model | Input (Credits/Token) | 5m Cache Write (Credits/Token) | 1h Cache Write (Credits/Token) | Cache Read (Credits/Token) | Output (Credits/Token) | Web Search (Credits/Use) |
|---|---|---|---|---|---|---|
| Claude Opus 5 | 5.00 | 6.25 | 10.00 | 0.50 | 25.00 | 10,000 |
Caching note
For Claude Opus 5, a 5-minute cache write is billed at 1.25x the input rate and a 1-hour cache write is billed at 2x. Cache reads are billed at 0.1x the input rate. Eligible prompts must contain at least 512 tokens.
Pricing note
Prices shown in the documentation are B.AI standard reference prices for base billing purposes. B.AI may provide lower actual usage costs through top-up bonuses and account benefits. Specific prices, bonus Credits, and account benefits are subject to the platform display and final billing records.