cerebras vs openai — AI API latency comparison
As of October 22, 2026, cerebras has lower edge latency (time-to-first-byte) than openai in 3 of 4 measured region(s). From Europe (Germany), cerebras responds in 199 ms p50 vs 294 ms.
Is cerebras or openai faster in each region?
| Region | cerebras p50 TTFB | openai p50 TTFB | Faster |
|---|---|---|---|
| Asia (Tokyo) | 209 ms | 208 ms | openai |
| Europe (Germany) | 199 ms | 294 ms | cerebras |
| South America (São Paulo) | 192 ms | 263 ms | cerebras |
| US (Central) | 76 ms | 148 ms | cerebras |
Full details: cerebras by region · openai by region.
Does the answer change by region?
The answer flips depending on where you measure from. In Europe (Germany) the gap is widest at 95 ms, while in Asia (Tokyo) it narrows to 1 ms — and the faster provider is not the same one in every region.
This is why a single-location benchmark cannot answer “is cerebras or openai faster” for you. Pick the row that matches where your requests originate.
Does cerebras or openai have better uptime?
Over the last 24 hours openai answered more probes successfully than cerebras: 100% against 99.9% across 4 region(s).
| Provider | Probes succeeding | Worst region | there | Samples |
|---|---|---|---|---|
| cerebras | 99.9% | Asia (Tokyo) | 99.7% | 1153 |
| openai | 100% | Asia (Tokyo) | 100% | 1153 |
Availability observed by our probes over the last 24 hours, not a contractual SLA. Providers publish their own SLA terms and their own status pages; this is an outside view of whether requests actually completed, which is the number a status page cannot give you about your own region. The worst region is shown next to the average because an average hides the one place where a share of your users sees a different service. Longer windows and all 4 regions: uptime comparison · confirmed outages: incidents.
What exactly is being compared?
Both providers are measured the same way, from the same probes, on the same schedule: a real connection is opened to each provider’s own API host and DNS, TCP, TLS and the first response byte are timed. Neither is measured through a gateway or aggregator, so the numbers reflect each provider’s own infrastructure. Figures are p50 and p95 over the last 24 hours; percentiles are nearest-rank, because a handful of outliers would distort an average.
What this comparison does not cover
This is edge latency — the time before the model starts working. It is the floor you pay on every request regardless of which model you call, and it is the part you cannot optimise away with a better prompt. It is not time-to-first-token, throughput, price or answer quality: those depend on the specific model, and comparing them across providers running different models would not be like-for-like. Measured time to first token (TTFT), with the model named next to every figure and the network share broken out, is on the time to first token page.
Method in full: methodology · Raw numbers under CC BY 4.0: JSON API · No provider pays for placement.