Claude Opus 4.5
anthropic/claude-opus-4-5-20251101The Claude 4.5 generation Opus
Use this model in the playground
Create an agent with this model, try it in the playground, and call your saved agent through the API.
Playground catalog rates, including your 5% Free-plan fee. Included usage applies first, then prepaid credits. Cached tokens and tools can have separate charges. Direct chat-completions routing is not currently listed for this exact model; use its saved agent ID with the Agents API.
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Choose how to use Claude Opus 4.5
Playground
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Model capabilities below describe the underlying model. Available playground features depend on its provider.
API
Connect your app with a Gizmo API key. Choose fastest or cheapest, stream text responses, and inspect timing, tokens, and charges in request logs.
Direct chat-completions routing is not listed for this exact model. Create a saved agent with this model and call it using the Agents API.
Provider price + a transparent platform fee
| Rate | Provider baseline | Free plan · 5% fee | Paid plan · 4% fee |
|---|---|---|---|
| Input / 1M tokens | $5 | $5.25 | $5.2 |
| Output / 1M tokens | $25 | $26.25 | $26 |
Legacy chat image rates use the catalog baseline. The dedicated image playground shows separate estimates and settles the provider’s metered usage. API rates are current routing ceilings; final API charges use provider-reported cost plus your fee. Cheapest routing compares eligible OpenRouter and Cheaper Inference rates for the same model; savings are not guaranteed. Cached input or other provider charges may differ. Compare all model rates and verified discounts →
How your plan pays for usage
API and playground share one included allowance. Usage including the fee draws from that allowance first, then your prepaid credits. Plans bill monthly; included usage resets weekly: Free $1, Starter $5, Growth $25, Scale $50.
A $1 provider charge becomes $1.05 on Free or $1.04 on a paid plan before included usage is applied. Plan eligibility still applies in the playground.
Free models and limits
Zero-cost models stay $0, including the fee, and do not consume your dollar allowance. Free accounts can make 1,000 free-model API requests per calendar month, resetting in UTC. Admitted requests count even if the provider fails.
Free includes 20 API requests/minute and 6 playground messages/minute. Paid plans raise these limits. See plan limits.
Before a text API request, Gizmo temporarily reserves included usage and, if necessary, prepaid credit for the model’s full context plus your maximum output. Image jobs reserve twice their displayed estimate. Unused funds return after metering. This hold can exceed the final charge; unconfirmed usage remains marked pending.
Overview
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and reasoning benchmarks, and improved robustness to prompt injection. The model is designed to operate efficiently across varied effort levels, enabling developers to trade off speed, depth, and token usage depending on task requirements. It comes with a new parameter to control token efficiency, which can be accessed using the OpenRouter Verbosity parameter with low, medium, or high.
Opus 4.5 supports advanced tool use, extended context management, and coordinated multi-agent setups, making it well-suited for autonomous research, debugging, multi-step planning, and spreadsheet/browser manipulation. It delivers substantial gains in structured reasoning, execution reliability, and alignment compared to prior Opus generations, while reducing token overhead and improving performance on long-running tasks.
Strengths
- Balanced frontier capability
- Extended thinking
Best for
Benchmarks
Design Arena head-to-head, human-voted
| Category | Elo | Win rate | Rank |
|---|---|---|---|
| Mobile apps (agent) | 1225 | 60.7% | #13 |
| Android native (agent) | 1192 | 65.5% | #15 |
| ASCII art | 1210 | 54.8% | #22 |
| Full-stack agents (agent) | 1165 | 60.2% | #22 |
| Web apps (agent) | 1181 | 55.1% | #23 |
| Data viz | 1260 | 58.5% | #24 |
| SVG | 1208 | 58.7% | #28 |
| 3D scenes | 1243 | 58.5% | #31 |
Capabilities
Reasoning is available.
Sampling controls: temperature, top_k, max_tokens.
Requests pass through the provider’s content moderation.
Pricing on Gizmo
These are provider baseline rates before Gizmo’s 5% Free-plan or 4% paid-plan fee. Your included usage covers charges first; overage uses prepaid credits. See the fee-inclusive comparison above.
Provider baseline rates
- Input
- $5 / 1M
- Cached input
- $0.5 / 1M
- Cache write
- $6.25 / 1M
- Output
- $25 / 1M
- Web search
- $0.01 / call
Examples before the platform fee
- Typical chat turn
- $0.0225 2k in · 500 out
- $1 of input
- ≈ 200k tokens
- $1 of output
- ≈ 40k tokens
- Full context, once
- $1.00
Providers and pricing
One way to run Claude Opus 4.5 on Gizmo.
| Provider | Route | Input / 1M | Output / 1M | Context | Uptime 24h |
|---|---|---|---|---|---|
| AnthropicLowest price | Direct | $5.00 | $25.00 | 200k | 99.8% |
Rates are each provider’s, per million tokens, before Gizmo’s 5% (Free) or 4% (paid) fee. “Cheapest” routing starts at the top of this list; “Fastest” starts with the model’s maker.
More from Anthropic
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Run Claude Opus 4.5 in under a minute
Create your account
Sign up with just an email. Start on the free tier with no card, or pick a paid plan for a bigger weekly allowance and $25 in bonus credits.
Your agent is ready
Claude Opus 4.5 is preselected as the brain of your first agent. Give it a name and a system prompt, or keep the defaults.
Chat, research, create
Live web research and image generation are built in. Every reply shows what it cost, and you can switch models anytime.