Claude Opus 5
Claude Opus 5 is Anthropic's newest flagship model, built for frontier-class agentic coding, computer use, and long-horizon multi-step work — deeply understanding codebases, holding the thread across complex tasks, with strong reasoning and knowledge work. Access the Claude Opus 5 API on Velokey at a lower price — one API key, pay as you go, below official pricing.
Use cases
Long-horizon software engineering · Computer use and enterprise automation
Input
Text, image
Output
Text
Billing
Per token
Start a conversation
Type a message below to begin
Sign up to get $0.5 in free credits — about 20 free images
Pricing details
Transparent usage-based pricing with no hidden fees.
Detailed Pricing
Usage-based pricing breakdown
Claude Opus 5
| Spec | Price | Official/Fal Price(USD) | Savings |
|---|---|---|---|
| Input/1M tokens | 2 Credits≈$2 | 5 Credits | -60% |
| Output/1M tokens | 10 Credits≈$10 | 25 Credits | -60% |
| Cache Read/1M tokens | 0.2 Credits≈$0.2 | 0.5 Credits | -60% |
Billing Rules
- Output price varies by model, resolution, quality, duration, or token usage.
- Uploaded reference files may be charged separately when supported.
- Add-on capabilities such as web search or image search may be billed per request.
- Token-based models are billed by input and output tokens.
- If the primary route is unavailable, Velokey may automatically switch to a stable fallback route when possible.
- Usage is pay-as-you-go with transparent credit deduction.
* Final cost depends on the generated result.
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Affordable Claude Opus 5 API
Access Anthropic's newest flagship, Claude Opus 5, at a lower price on Velokey — frontier-class agentic coding, computer use, and strong reasoning, OpenAI-compatible, one API key, pay as you go, below official pricing.
Meet Claude Opus 5 and its API integration
Claude Opus 5 is Anthropic's newest flagship model, built for long-running, multi-step engineering and automation — strong at agentic coding, computer use, and rigorous reasoning, understanding codebases deeply and staying coherent across complex tasks for longer. On Velokey you can access the Claude Opus 5 API at a lower price — one API key, pay as you go, below official pricing, no forced subscription — with credits, usage, and multi-model routing all managed in one console.
Frontier-class agentic coding
Claude Opus 5 is built for long-running, multi-step software engineering — understanding codebases deeply and holding context and coherence across complex tasks, with a large jump over Opus 4.8 on agentic coding benchmarks like Frontier Bench, a fit for engineering agents that autonomously refactor, fix, and ship features.
View docs →
Computer use and enterprise automation
Opus 5 can drive browsers and desktops to complete tasks, leading on computer-use (OSWorld) and enterprise-automation (Automation Bench) evaluations, so agents don't just generate text — they click, fill in, and chain business systems to run end-to-end automation.
View docs →
Strong reasoning and long coherence
A large lead on reasoning evaluations like ARC-AGI, strong at decomposing complex problems, reasoning rigorously across many steps, and staying consistent over long horizons — a fit for planning, analysis, and tasks that need deep thinking held across many steps.
View docs →
Flagship-grade knowledge work, more aligned
High scores on knowledge-work evaluations (GDPVal-AA) with near-flagship intelligence for research, writing, and professional analysis; it is also one of Anthropic's most aligned models to date, with more stable, predictable behavior for production.
View docs →
How to deploy the Claude Opus 5 API on Velokey
A few steps to start calling.
Register and get an API key
Create an API key in the Velokey console; one key authenticates every request sent to Claude Opus 5.
Set the model
Set model to claude-opus-5 and submit messages and tools (function calling) as needed.
Call and integrate
Send requests through Velokey's unified /v1/chat/completions endpoint, compatible with the OpenAI calling convention; the Anthropic-native /v1/messages endpoint is supported too, with usage and credits managed in one console.
Claude Opus 5 real-world use cases
From long-horizon engineering to computer use and knowledge work, a fit for many high-value scenarios.
Long-horizon software engineering
Understand codebases deeply and stay coherent across steps to autonomously refactor, fix, and ship features.
Computer use and automation
Drive browsers and desktops and chain business systems to build automation agents that actually take actions.
Complex reasoning and planning
Decompose complex problems and reason and plan rigorously across many steps for hard decisions and analysis.
Research and knowledge work
Long-document understanding, synthesis, and structured output as a daily assistant for research and analysis teams.
Enterprise process automation
Hand multi-step business processes to an agent to run end-to-end automation across tools and systems.
Writing and professional content
Near-flagship intelligence for high-quality writing, reports, and professional content, with stable, predictable behavior.
Why choose Velokey for Claude Opus 5
Below official pricing
Call Claude Opus 5 at a lower price on Velokey — pay as you go, no forced subscription, lower upfront cost.
One key, many models
A single API key reaches Claude Opus 5 and other vendors' models, turning task routing and cross-model fallback into configuration rather than rewrites.
Unified OpenAI-compatible access
Compatible with the OpenAI calling convention and the Anthropic-native Messages API; switching models is a single model-field change, keeping integration cost minimal.
Stability and high availability
Automatic failover and stable fallback routes maintain availability when the primary route is down, keeping production steady.
API Reference
Complete API call examples and parameter descriptions
Endpoint
https://api.velokey.ai/v1/messagesAuthentication
Bearer YOUR_API_KEYRequest Example
curl https://api.velokey.ai/v1/messages \
-X POST \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "claude-opus-5",
"messages": [{"role": "user", "content": "Hello!"}],
"temperature": 0.7
}'Response Example
{
"id": "req_abc123",
"model": "claude-opus-5",
"created": 1234567890,
"data": { ... }
}Claude Opus 5 API FAQ
What is the Claude Opus 5 API?
Claude Opus 5 is Anthropic's newest flagship model, built for frontier-class agentic coding, computer use, and long-horizon multi-step work. On Velokey you call it through unified OpenAI-compatible access, with model set to claude-opus-5.
What makes Claude Opus 5 stand out?
It's built for long-running, multi-step engineering and automation — understanding codebases deeply, staying coherent across complex tasks, and excelling at agentic coding, computer use (driving browsers and desktops), enterprise automation, and rigorous reasoning. It is also one of Anthropic's most aligned models to date, and leads on benchmarks like Frontier Bench, ARC-AGI, and OSWorld.
Does Claude Opus 5 support computer use and tools?
Yes. Claude Opus 5 supports function calling (tools) and computer use, driving browsers and desktops and chaining external tools to build agentic workflows that actually take multi-step actions.
How does Claude Opus 5 compare to Opus 4.8?
Opus 5 is a large step up over Opus 4.8 on agentic coding, computer use, and reasoning, with stronger coherence on long-horizon multi-step tasks, near-flagship intelligence, and improved alignment.
How is it billed on Velokey?
The pricing section on this page shows current Velokey prices, billed by input and output tokens (about $2 input / $10 output per 1M tokens, official $5/$25). Credits are managed from one Velokey account.
Start building with Claude Opus 5 today
Use one API key to access low-cost, stable AI models through Velokey.