Caching.ai vs Cloudflare AI Gateway: Edge Cache or Prompt-Cache Optimizer?
Cloudflare AI Gateway adds edge response caching, logs and rate limits for free. Caching.ai maximizes the provider-side prompt-cache discount. What each covers, what neither does, and when to combine them.
Short version: Cloudflare AI Gateway is free operational plumbing at the edge — logs, rate limits, retries, and an exact-match replay cache. Caching.ai is cache economics — it makes the provider's prompt-caching discount actually land. The overlap is one word and one integration pattern (both are a base-URL swap); the jobs are different. (Disclosure: Caching.ai is our product. Corrections → support@caching.ai.)
What each tool is
Cloudflare AI Gateway sits on Cloudflare's edge in front of your AI provider. You get request logs and analytics, rate limiting, retries and fallbacks, and response caching: identical requests can be served from the edge with a configurable TTL — free at its core, minutes to set up.
Caching.ai is a drop-in proxy for Anthropic, OpenAI, Gemini and Grok focused on the provider-side prompt cache: hit-rate and wasted-spend analytics, automatic cache_control injection, cache-breaker diagnostics, economically-guarded cache warming through idle gaps, and TTL auto-tuning. On a public benchmark of 10,000+ billed calls: 67% saved on sparse support traffic, 89% on a shared-prefix batch, GPT-5.6 prefix hits restored from 0% to 97.8%+.
| Caching.ai | Cloudflare AI Gateway | |
|---|---|---|
| Category | Prompt-cache cost optimizer | Edge AI gateway |
| Caching | Provider prefix-cache optimization | Exact-match response replay at the edge |
| Saves money on | Every request reusing a prefix (agents, chat, RAG) | Identical repeated requests only |
| Freshness risk | None — model always runs | Replayed responses; TTL to manage |
| Rate limits / retries / fallbacks | No | Yes |
| Cache accounting | Verified $ saved / $ wasted, net of warming | Request analytics and logs |
| Prompt bodies stored | Never by default | Logging configurable |
| Open source / self-host | Apache-2.0 core, docker compose | No (managed service) |
| Pricing | 20% of verified savings; <$5/mo waived | Free core |
Choose Cloudflare AI Gateway if…
- You want free, zero-maintenance logs, rate limits and retry/fallback in front of any provider.
- Meaningful traffic is literally identical requests (public demos, repeated evals) where edge replay shines.
- You're already deep in the Cloudflare ecosystem.
Choose Caching.ai if…
- Your bill is prefix-shaped: agents and chatbots resending system prompts, tools and history all day.
- You want breakpoints, warming and TTL choices handled automatically and proven on provider-reported usage.
- You want self-hosting as an option and no prompt bodies stored by default.
The honest bottom line
“Free edge cache” and “90% prefix discount” are not competing claims — they apply to disjoint slices of your traffic. Look at one day of usage: count exact-duplicate requests (AI Gateway's territory) versus requests that reuse a prefix (prompt caching's territory). For most production LLM apps the second number is 10x the first, which is why we built what we built. Wider context: Top 7 LLM caching tools · prompt vs semantic caching.
Frequently asked questions
Is Cloudflare AI Gateway's caching the same as prompt caching?
No. AI Gateway caches whole responses at the edge and replays them when an identical request repeats. Prompt caching is the provider billing repeated prompt prefixes at ~10% while still generating a fresh answer. AI Gateway's cache does nothing for your prefix hit rate, and Caching.ai does nothing for identical-request replay — they're different layers.
Can I use Cloudflare AI Gateway and Caching.ai together?
Technically yes — both are base-URL proxies, so they can chain. In practice pick by need: keep AI Gateway if you value its edge logs, rate limits and free replay cache, and point the traffic whose bill is prefix-shaped (agents, chatbots) through Caching.ai. Chaining both adds a hop that only pays if you genuinely use both feature sets.
Cloudflare AI Gateway is free — why would I pay for Caching.ai?
Because they save different money. AI Gateway's cache only helps when the exact same request repeats. Caching.ai targets the much larger line item — the 90% prefix discount on every request that reuses a system prompt or history — and it charges 20% of savings it can verify against provider-reported usage, with fees under $5/month waived. If it saves nothing, it costs nothing.