🤖 Ghostwritten by Claude Opus 4.6 · Fact-checked & edited by GPT 5.4 · Curated by Tom Hundley
If /fast in OpenClaw does not feel faster, the issue is usually one of three things: your provider does not support service tiers, your configuration is in the wrong place, or OpenClaw sent the request but the provider did not honor it. The practical way to check is simple: confirm your OpenClaw version, enable /fast, then inspect response metadata for the tier field or OpenClaw's verification status.
OpenClaw's fast mode is meant to map the /fast toggle to an API provider's service_tier-style setting when that provider supports one. In other words, it is a routing and latency feature, not a model-quality feature. This guide explains how to verify whether fast mode is actually being applied, what common failures look like, and how to troubleshoot them safely. If you still need the initial setup steps, start with our OpenClaw Claude Fast Mode Guide.
TL;DR: Service tiers are provider-side routing options that may reduce latency, but support, naming, and pricing vary by API provider and plan.
When you send a request to a hosted AI model, some providers let you request a faster processing path. In many APIs, that is exposed through a parameter such as service_tier or a similar provider-specific option.
The important distinction is this:
That means fast mode does not inherently make the model less capable. It asks the provider to prioritize responsiveness for the same model you were already using.
| Action | What Changes | Intelligence Level | Speed Impact |
|---|---|---|---|
| Switch to a smaller model | Different model | Usually lower | Often much faster |
Enable /fast |
Same model, different routing or priority handling | Same | Potentially faster |
| Use both | Smaller model plus faster routing | Usually lower | Fastest, when supported |
Because provider implementations differ, treat fast mode as a request rather than a guarantee. The provider may accept it, ignore it, or restrict it based on your account, model, or current traffic conditions.
TL;DR: The best proof is response metadata from the provider or OpenClaw's own verification output, not just a subjective sense that replies feel faster.
If you already enabled fast mode, use the steps below to confirm whether it is actually being applied.
First, make sure you are running the release that includes the fast-mode behavior you expect. If your environment was updated around the time of a reissued release, verify that you pulled the latest build rather than assuming the version tag alone tells the full story.
If your team follows a standard upgrade workflow, our upgrade and verify guide for v2026.3.11 covers the general process.
Use a short prompt so latency differences are easier to notice and logs are easier to inspect.
Example test:
/fast
Summarize the key differences between REST APIs and GraphQL in three bullet points. Keep it under 50 words total.Then send the same prompt again with fast mode disabled. Compare:
A timing difference alone is suggestive, but not conclusive. Network conditions and provider load can vary from one request to the next.
Look for provider or application metadata that indicates whether a tier request was sent and whether it was applied. Depending on your OpenClaw theme or deployment, this may appear in a response details panel, logs, or a small info icon near the message.
Useful signals include:
service_tiertier_verifiedInterpret those signals carefully:
tier_verified: true suggests OpenClaw found evidence that the provider applied the requested tier.tier_verified: false suggests the request may have been sent, but OpenClaw could not confirm that the provider honored it.This is the step many people skip. OpenClaw can only map /fast to a real provider feature if that provider and model expose one. Local runtimes such as Ollama, vLLM, and SGLang generally do not offer cloud-style service tiers because you control the hardware and scheduling yourself.
If you are using a local model stack, /fast may be ignored or treated as a no-op.
TL;DR: Most failures come from unsupported providers, misplaced configuration, or account-level limits rather than from the /fast command itself.
The most common cause is configuration placement. If your provider-specific settings are structured incorrectly, OpenClaw may record that fast mode is on without translating it into the outgoing API request.
A safe example with placeholders looks like this:
provider:
name: anthropic
api_key: YOUR_ANTHROPIC_API_KEY
params:
fastMode: trueIf fastMode is outside the provider's params block, OpenClaw may not map it correctly.
This usually means one of the following:
If you are using a local provider, an error may also indicate that the integration should ignore fast mode more gracefully than it currently does.
If tier_verified remains false, that does not necessarily mean the request failed. It often means OpenClaw could not confirm that the provider honored the request.
Possible reasons include:
In short: the request may still complete normally, just without priority handling.
TL;DR: Fast mode does not require new secrets, but troubleshooting often leads people to overshare configs, so redact everything before posting logs or screenshots.
Fast mode uses the same provider credentials you already configured. The risk is not the feature itself; the risk is how people debug it.
Follow these basics:
YOUR_API_KEY before sharing config snippets.Service-tier settings are not sensitive on their own. Credentials, project identifiers, and internal endpoints are.
Not necessarily. Pricing depends on the provider, the plan, and how that provider implements priority handling. Check the provider's current pricing and API documentation rather than assuming the toggle is free or paid.
Usually no, at least not in the same sense as a hosted API service tier. Local inference stacks generally do not expose cloud-style priority routing because scheduling happens on your own infrastructure.
Verify the installed build in the UI or release metadata, then test /fast and inspect response details. If the command is unrecognized or metadata never appears, update to the latest available release for your environment.
No. Support depends on the provider, the specific model, and your account entitlements. Even within one provider, some models may expose tier controls while others do not.
Usually yes, if your provider configuration supports a default fastMode setting. Just remember that a default request is still only a request; the provider may not honor it on every call.
If OpenClaw fast mode is not working, start with the basics: confirm your version, verify your provider supports service tiers, and inspect response metadata instead of relying on feel alone. In most cases, the issue is either configuration placement or a provider limitation rather than a broken /fast command.
If you are documenting this for your team, pair this guide with our OpenClaw Claude Fast Mode Guide so people have both the setup steps and the troubleshooting workflow in one place. And if you are preparing for local-model changes next, keep an eye out for our upcoming coverage of the provider-plugin architecture.
Discover more content: