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Claude Opus 5
Claude Opus 5 is Anthropic's Opus-tier flagship large language model released on July 24, 2026, positioned as the default choice for complex agentic coding and enterprise knowledge work. The model features a 1 million token context window (128K max output), accepts text and image input with text output, and has a knowledge cutoff of May 2026. Adaptive thinking is on by default, with five reasoning effort levels (low/medium/high/xhigh/max). Anthropic describes it as delivering near-Fable-5 intelligence at half the price, scoring 43.3% on Frontier-Bench v0.1 (surpassing Fable 5's 33.7%) and 70.0% on CursorBench (within 0.5 points of Fable 5's 70.5%).
The iCreat platform offers this model via the endpoint https://api.icreat.ai/llm/anthropic/v1/messages (Anthropic Messages API compatible), at $1 per million input tokens and $5 per million output tokens — one-fifth of the official standard pricing.
Model Positioning
Claude Opus 5 is positioned as Anthropic's Opus-tier flagship, designed for complex agentic coding and enterprise knowledge work.
Anthropic recommends starting most workloads with Opus 5 and escalating to Fable 5.1 when tasks demand the strongest reasoning or long-horizon autonomous execution. Opus 5 delivers near-flagship reasoning at half the price of Fable 5.1, making it the best-value default choice.
On the iCreat platform, the model is served through an Anthropic Messages API compatible endpoint at one-fifth of the official standard pricing.
Core Capabilities
Complex Agentic Coding
Designed for repository-scale coding tasks including multi-file feature development, large refactors, and long autonomous sessions, with self-verification and iteration capabilities that check their own work without instruction.
1 Million Token Ultra-Long Context
Supports a 1,000,000 token context window (both default and maximum, no smaller context variant), with 128,000 token max output, enabling ingestion of entire codebases or complete document sets.
Adaptive Thinking
Thinking is on by default, with the model automatically deciding when and how much to think. Five reasoning effort levels (low/medium/high/xhigh/max) provide flexible control. Lower levels significantly reduce cost and latency while maintaining strong quality.
Multimodal Input
Accepts text and image input, supporting high-resolution chart, document, screenshot, and UI replication visual tasks.
Prompt Caching Optimization
Minimum cacheable prompt length reduced to 512 tokens (from 1024 on the predecessor), with cache read pricing at only $0.1/M tokens (iCreat platform price) — one-tenth of the standard input rate.
Pricing
| Token Type | Unit Price | Unit |
|---|---|---|
| Input | $1 | per million tokens |
| Output | $5 | per million tokens |
| Cached Read | $0.1 | per million tokens |
| Cache Write | $1.25 | per million tokens |
Note: The above are iCreat platform prices. Anthropic's official standard pricing is $5 input, $25 output, $0.50 cache read, and $6.25 cache write per million tokens; iCreat's price is approximately one-fifth of the official rate. The iCreat platform price shall prevail.
Application Scenarios
- Multi-file agentic coding and large-scale code refactoring
- Enterprise-grade long-document analysis (contracts, papers, filings, 200-page PDFs)
- Financial modeling, spreadsheets, and slide deck generation
- Multi-agent workflows with sub-agent delegation and verification
- Visual tasks (charts, screenshots, UI replication understanding)
Model Comparison
Comparison Table 1: iCreat Pricing vs. Anthropic Official Standard Pricing
| Feature | iCreat Platform | Anthropic Official Standard |
|---|---|---|
| Input Price | $1/M tokens | $5/M tokens |
| Output Price | $5/M tokens | $25/M tokens |
| Cached Read | $0.1/M tokens | $0.50/M tokens |
| Cache Write | $1.25/M tokens | $6.25/M tokens |
| Endpoint | iCreat Anthropic-compatible | Anthropic official API |
| Model ID | claude-opus-5 | claude-opus-5 |
Note: iCreat pricing is approximately one-fifth of the official standard; model capabilities are identical. Anthropic also offers Fast mode (2x speed, 2x price) and Batch API (50% discount on standard rates).
Comparison Table 2: Anthropic Flagship Models
| Feature | Claude Opus 5 | Claude Fable 5.1 | Claude Opus 4.8 |
|---|---|---|---|
| Positioning | Default flagship, best value | Most capable public model | Previous Opus flagship |
| Release Date | 2026-07-24 | 2026-09-01 | 2026-05-28 |
| Context Window | 1M tokens | 1M tokens | 1M tokens |
| Max Output | 128K tokens | 128K tokens | 128K tokens |
| Input Price (Official) | $5/M tokens | $10/M tokens | $5/M tokens |
| Output Price (Official) | $25/M tokens | $50/M tokens | $25/M tokens |
| Adaptive Thinking | On by default | Always on | Requires manual enable |
| Frontier-Bench v0.1 | 43.3% | Per official | 18.7% |
| CursorBench | 70.0% | Per official | Per official |
Note: Opus 5 delivers near-Fable-5.1 intelligence at half the price, and even surpasses Fable 5 on Frontier-Bench; compared to Opus 4.8 it offers the same price with significantly improved capabilities — a full drop-in upgrade.
Why Choose Claude Opus 5?
- Near-flagship reasoning at half the price of Fable 5.1
- 1 million token ultra-long context for entire codebase ingestion
- Adaptive thinking on by default with five reasoning effort levels
- Frontier-Bench v0.1 score of 43.3%, surpassing Fable 5 (33.7%) at lower cost
- Multimodal input supporting text and images for visual workflows
- iCreat platform pricing at one-fifth of the official standard
Specifications
| Field | Value |
|---|---|
| Model Name | Claude Opus 5 |
| Developer | Anthropic |
| Model ID | claude-opus-5 |
| Endpoint | https://api.icreat.ai/llm/anthropic/v1/messages |
| SDK base_url | https://api.icreat.ai/llm/anthropic |
| Release Date | 2026-07-24 |
| Model Type | Opus-tier flagship LLM |
| Authentication | Authorization: Bearer |
| Context Window | 1,000,000 tokens (1M, default and maximum) |
| Max Output | 128,000 tokens (128K) |
| Knowledge Cutoff | 2026-05 |
| Input Modalities | Text, Image |
| Output Modalities | Text |
| Adaptive Thinking | On by default, can be disabled at effort ≤ high |
| Reasoning Effort | low / medium / high (default) / xhigh / max |
| Streaming | Supported |
| Function Calling | Supported |
| Structured Output | Supported |
| Prompt Caching | Supported (min 512 tokens, 5-minute / 1-hour TTL) |
| Min Cacheable Prompt | 512 tokens |
| Billing Unit | Per million tokens |
Architecture
The iCreat platform's Claude Opus 5 is served through an Anthropic Messages API compatible endpoint, allowing users to call it with the official Anthropic SDK or any compatible SDK. Requests must include the API Key in the Authorization header. The request body uses the Anthropic Messages format (model, max_tokens, system, messages fields). Adaptive thinking is on by default and requires no manual activation; reasoning intensity is controlled via the effort parameter. Disabling thinking is permitted only at effort high or below; pairing with xhigh or max returns a 400 error. The model supports streaming (stream: true), function calling, prompt caching, and mid-conversation tool changes (beta). The minimum cacheable prompt length is 512 tokens, with cache read pricing at one-tenth of the standard input rate.
Notes
- Adaptive thinking is on by default; max_tokens limits total output (thinking plus visible response), so set it appropriately
- Disabling thinking is permitted only at effort high or below; pairing with xhigh or max returns a 400 error
- API Key should be passed via environment variables; avoid hardcoding it in source code
- iCreat platform pricing is approximately one-fifth of the official standard; model capabilities are identical
- Start with the default high effort, then adjust reasoning effort levels after measuring quality and cost
- Cache read costs only $0.1/M tokens — one-tenth of the standard input rate, significantly reducing costs for repeated queries
- The model supports text output only; it cannot generate images, video, or audio
- Please safeguard your API Key and avoid hardcoding it in client-side code or public repositories
Frequently Asked Questions
What is the difference between iCreat pricing and Anthropic's official pricing?
iCreat platform pricing is approximately one-fifth of the official standard (input $1 vs $5, output $5 vs $25), with the same model ID and capabilities. Cache read on iCreat is $0.1 vs $0.50 on official. The iCreat platform price shall prevail.
Should I choose Opus 5 or Fable 5.1?
Anthropic recommends starting most workloads with Opus 5 (priced at half of Fable 5.1) and escalating to Fable 5.1 when tasks demand the strongest reasoning or long-horizon autonomous execution. Opus 5 scores 43.3% on Frontier-Bench v0.1, even surpassing Fable 5 (33.7%), making it the best-value default choice.
Can adaptive thinking be turned off?
Yes, but only at effort high or below. Set thinking: {"type": "disabled"} with effort ≤ high to disable. Pairing with xhigh or max returns a 400 error. It is recommended to keep thinking enabled and control cost by lowering the effort level.
How do I choose reasoning effort?
Five levels: low (rapid response), medium, high (default), xhigh, and max (maximum reasoning). Higher levels produce deeper reasoning but with greater latency. Opus 5 converts additional effort into better results more reliably than any previous Opus model. Start at the default high, step down for simple tasks, step up for the most demanding work.
Is streaming output supported?
Yes. Pass "stream": true in the request body to enable streaming. The model will return generated content token by token.
Is function calling supported?
Yes. The model is compatible with the Anthropic Tool Use protocol, and also supports structured output (JSON Schema), prompt caching, and mid-conversation tool changes (beta). Native web search is not supported (use external search tools via function calling).