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Opus Fast - Run Claude Opus 4.6 at 2.5x Speed Online
Experience Opus Fast mode online free. Get 2.5x faster Claude Opus 4.6 responses instantly. Speed benchmarks, latency tests, and fast mode access.
Waiting 30 Seconds Per Response? Opus Fast Cuts That to 12
Every second you stare at a loading spinner is a second wasted. Opus Fast delivers the full power of Claude Opus 4.6 at 2.5x the output speed. Your debugging sessions, code reviews, and analysis tasks finish in nearly half the time with Opus Fast mode enabled.
Type your question or paste code below - zero signup required
Opus Fast processes your request at 2.5x output speed
Get the same Opus 4.6 quality answers, dramatically faster
What Makes Opus Fast Different from Standard Opus 4.6
Opus Fast is a speed-optimized inference mode for Claude Opus 4.6, launched February 2026. It delivers output tokens up to 2.5x faster than standard Opus 4.6 while maintaining identical intelligence and accuracy. Opus Fast achieves this by prioritizing throughput on the backend - same model weights, same reasoning depth, just significantly faster delivery. When you run an Opus Fast speed test, you will see response times drop from 30 seconds to roughly 12 seconds on typical queries.
How Opus Fast Achieves 2.5x Faster Output
Opus Fast uses an optimized inference configuration that increases output tokens per second without sacrificing model quality. Standard Opus 4.6 prioritizes cost efficiency, while Opus Fast prioritizes raw speed. The result: your code completions, bug analyses, and multi-step reasoning chains arrive dramatically faster. Opus Fast still uses adaptive thinking to calibrate reasoning depth - quick questions get instant replies, complex problems get thorough analysis, all at accelerated speed.
Why Developers Choose Opus Fast Over Standard Speed
Frustrations Opus Fast Eliminates
- Cut response wait times from 30s to 12s with Opus Fast
- Stay in flow state during rapid debugging sessions
- Stop losing focus while waiting for AI completions
- Opus Fast delivers full Opus 4.6 intelligence at 2.5x speed
- Run complex code reviews without painful delays
- Iterate faster on architectural decisions with Opus Fast
- Complete multi-file refactoring in half the wall-clock time
- Ship production fixes faster when every minute counts
- Opus Fast latency reduction transforms pair programming
- Handle urgent deadlines with accelerated AI assistance
- Get benchmark-leading quality without benchmark-trailing speed
Opus Fast Technical Specifications
- Opus Fast output: 2.5x tokens per second vs standard
- Same 65.4% Terminal-Bench 2.0 benchmark score
- Same 1 million token context window
- Opus Fast latency: typical 12s vs 30s standard response
- Same 76% MRCR v2 long-context retrieval accuracy
- Toggle Opus Fast via /fast in Claude Code CLI
- Available on API, Claude Code, GitHub Copilot
Opus Fast Speed Test - Real-World Performance
Do not take our word for it - run your own Opus Fast speed test right here. Paste a complex coding problem or multi-step analysis task and watch how quickly Opus Fast returns a thorough answer. Developers switching from standard Opus 4.6 to Opus Fast report their interactive coding sessions feel completely different. The reduced latency makes AI-assisted development feel like genuine pair programming rather than waiting for a remote colleague.
- Run an Opus Fast speed test directly on this page
- Compare Opus Fast latency against standard Opus 4.6
- Opus Fast benchmark: coding tasks complete 2x sooner
- Measure real-world Opus Fast throughput on your own prompts
- Claude Opus 4.6 fast mode handles rapid iteration cycles
- Test Opus Fast with large codebases and long contexts
- Verify Opus Fast delivers identical quality at higher speed
- Experience the Opus Fast difference in under 60 seconds
Opus Fast Privacy and Availability
Opus Fast processes your data with the same strict privacy controls as standard Claude Opus 4.6. Your code is never used for model training, retention is limited to 30 days, and Opus Fast has the lowest over-refusal rate among frontier models. The fast mode is currently in research preview, available through Claude Code, the direct API, and GitHub Copilot.
- Your code is never used for training with Opus Fast
- 30-day maximum data retention policy
- Opus Fast shares all Opus 4.6 safety certifications
- No sycophantic or misleading outputs
- Enterprise security: GDPR and SOC 2 compliant
- Transparent safety evaluations published
- Opus Fast available as research preview today
Try Your Own Opus Fast Speed Test - Zero Barriers
No credit card. No signup form. No waitlist. Just open this page and run your personal Opus Fast speed test immediately. Feel the 2.5x difference and see why developers are switching to Opus Fast for every serious coding session.
Opus Fast - Your Speed Questions Answered
Everything You Need to Know About Opus Fast Mode
- Opus Fast is a speed-optimized inference mode for Claude Opus 4.6 that delivers output tokens up to 2.5x faster. You get the exact same model intelligence - same 65.4% Terminal-Bench 2.0 score, same 1 million token context, same reasoning quality. The only difference is throughput: Opus Fast prioritizes speed on the backend, cutting typical response times from 30 seconds down to roughly 12 seconds. Think of Opus Fast as the turbo mode for an engine that already leads every benchmark.
- Standard Opus 4.6 optimizes for cost efficiency, which means slower output. Opus Fast optimizes for raw speed, delivering 2.5x more output tokens per second. If you are in a rapid debugging session, reviewing code iteratively, or running agentic workflows where every second of latency compounds, Opus Fast dramatically improves your experience. The speed difference transforms AI-assisted coding from a stop-and-wait pattern into genuine real-time collaboration.
- You can run an Opus Fast speed test directly on this page - just scroll up and start typing. No signup, no credit card, no configuration. For developers using Claude Code CLI, type /fast to toggle Opus Fast mode on. API users can set speed to fast in their request parameters. Opus Fast is also rolling out on GitHub Copilot for Pro+ and Enterprise users. Getting started with Opus Fast takes less than 10 seconds.
- Opus Fast is accessible through multiple channels. Claude Code CLI supports Opus Fast via the /fast toggle. The direct API lets you set Opus Fast mode with a speed parameter. GitHub Copilot is rolling out Opus Fast support for Pro+ and Enterprise tiers. Note that Opus Fast is currently a research preview and is not yet available on Amazon Bedrock, Google Vertex AI, or Azure Foundry. This page offers free Opus Fast access with no restrictions.
- Opus Fast shines in interactive, iterative workflows. Debugging sessions where you go back and forth rapidly, code reviews with multiple rounds of feedback, and agentic coding tasks that chain many requests together. In these scenarios, Opus Fast latency reduction from 30 seconds to 12 seconds per turn saves enormous wall-clock time. For a 20-turn debugging session, that is 6 minutes saved with Opus Fast. For batch or non-interactive workloads, standard Opus 4.6 may be more cost-effective.
- Developers in rapid iteration cycles see the biggest Opus Fast gains. If your workflow involves frequent AI queries - debugging, refactoring, code generation, test writing - the 2.5x speed boost from Opus Fast compounds into hours saved per week. Engineering teams running agentic workflows benefit enormously because Opus Fast reduces the latency of every agent step. Security researchers running vulnerability scans and data scientists iterating on analysis pipelines also report significant productivity jumps with Opus Fast.
- In practice, Opus Fast cuts the wait between responses from 20-40 seconds down to 8-16 seconds. That might sound modest on paper, but the difference in perceived flow is dramatic. With standard speed, you context-switch while waiting. With Opus Fast, the response arrives before you lose your train of thought. Developers testing Opus Fast report that the speed improvement makes AI pair programming feel natural rather than frustrating. Run your own Opus Fast speed test on this page to feel the difference.
- Opus Fast maintains the full 1 million token context window of standard Opus 4.6. The speed optimization is focused on output tokens per second, not on reducing context capacity. You can paste an entire repository into Opus Fast and receive rapid, context-aware responses. The 76% MRCR v2 long-context retrieval score means Opus Fast genuinely reads everything you provide, and it delivers those informed answers at 2.5x the standard output speed.
- The core difference is output speed: Opus Fast delivers 2.5x more tokens per second. Intelligence, accuracy, context window, and safety features are identical. Opus Fast uses the same adaptive thinking, the same agent teams capability, and the same effort controls. The tradeoff is cost: Opus Fast API pricing is higher at $30/$150 per million tokens versus $5/$25 for standard. On this page, you can test Opus Fast for free without worrying about API costs.
- Opus Fast runs the same model that leads major benchmarks: 65.4% Terminal-Bench 2.0 for agentic coding, 76% MRCR v2 for long-context retrieval, and 90.2% BigLaw Bench for legal reasoning. No competing model matches these scores. The Opus Fast advantage is that you get these benchmark-leading results delivered 2.5x faster. In a head-to-head Opus Fast speed test against GPT 5.2 or Gemini, the combination of accuracy and throughput puts Opus Fast in a class of its own.
- Yes. This page provides free Opus Fast access with no account required. Type your question and experience the speed difference immediately. For heavy production usage, Opus Fast API pricing runs $30 per million input tokens and $150 per million output tokens, with Anthropic offering a 50% introductory discount. Claude Pro subscribers get Opus Fast access at $20 per month. But to run a quick Opus Fast speed test and feel the 2.5x difference? Completely free, right here.