Getting started with AI tools used to mean picking a single vendor and hoping the trial credits lasted. In late 2026 the landscape is still friendly — but tighter than a year ago. A surprising number of providers hand you genuinely usable free API access, and because SynthHires is bring-your-own-key (BYOK), you can stack several of them and switch freely without the platform ever holding a key.
Here's the honest October 2026 picture, provider by provider, with the exact console and the real free tier.
The short answer
These are the fastest free wins right now:
- Google Gemini — still free, no card, via AI Studio (
aistudio.google.com/apikey). The Flash/Flash-Lite lineup keeps a free tier with per-project rate limits (Google tightened the quotas in 2026, and limits are per project, not per key). - Groq — free access gated only by rate limits (
console.groq.com/keys); the daily request ceiling was reduced in late 2026, so treat it as a prototyping tier. - Mistral — the free Experiment plan on La Plateforme gives rate-limited access to the whole API catalog, including Mistral Large 3 and Codestral.
- xAI (Grok) — new accounts historically get around 175/month.
- Cerebras — free inference tier on registration for several open models (
cloud.cerebras.ai). - Cohere — free trial/developer keys with rate limits (
dashboard.cohere.com). - OpenRouter — **25+ models at literally 10 credit purchase. One key routes to 500+ models.
- Kimi / Moonshot and Qwen (Alibaba) — free tiers for several models to test with.
The rest (OpenAI, Anthropic, DeepSeek, Perplexity, Azure) are effectively not free for real use — you typically add credits or billing before a key works. That's expected: they're the frontier labs, and they price that capability.
What changed in 2026
If you read a free-tier guide from early 2025, several things have shifted:
- Gemini tightened its free API tier. The generous legacy quotas shrank; limits are now RPM/TPM/RPD per project, and some models dropped off the free tier entirely. Flash-class models remain the free workhorses.
- Groq's free tier got smaller. Still zero-cost and fast, but the daily request ceiling dropped — plan for development use, not batch jobs.
- Brave Search removed its all-free plan. The API is now metered with a monthly spend cap you control.
- OpenRouter switched mechanics. Instead of small promotional credits, the deal is now a standing roster of 25+
:freemodels with a 50 req/day cap (1,000/day after a one-time $10 top-up). - xAI formalized the data-sharing credits. Opt in to share API data for training and you can earn up to $175/month in credits — the largest recurring free program among frontier labs.
- Model lineups moved a generation. GPT-6 Astra/6.1 Sol/6 Luna at OpenAI, Claude Opus 5.5/Sonnet 5.5/Haiku 4.5 at Anthropic, Gemini 3.x Flash at Google, Grok 4.7 at xAI, DeepSeek V4 with 1M context, and Mistral Large 3 — every free tier above gets you access to current-generation models, not leftovers.
How to stack free tiers
Because SynthHires lets you bring your own keys and switch the active provider per conversation, "free" is a menu, not a single choice:
- Grab a Gemini key and a Groq key (both free, no card).
- Add OpenRouter as an escape hatch (25+
:freemodels, no card). - Add xAI, Cerebras and Cohere if you want the trial credits while they last.
You can move between them in chat without copying data anywhere — the platform is just the orchestration surface. Your keys live encrypted in your browser (AES-256-GCM) and never travel to our servers. See Get API keys for the full per-provider walkthrough.
Two honest caveats
- "Free" means rate-limited. Free tiers are for prototyping and light use, not batch jobs. When you scale, move to the paid tier of whichever provider you liked.
- Free tiers change. Promo credits expire; quotas get tuned. This guide was last verified October 1, 2026 — the Get API keys page reflects our current research and links to each official console so you can confirm before committing.
Why BYOK makes free tiers actually useful
On most platforms, whatever credits you have are locked to that platform's bundled account. BYOK inverts this: you hold the keys, so your free-tier Gemini credits are usable the moment you paste the key in — no migration, no lock-in, no resold tokens. It's the difference between renting a single model and walking into a room full of them.
The mechanics (envelopes, single-use handoffs, why a stateless runtime matters) are worth understanding before you trust it — read Security & BYOK and Bring Your Own Key, explained for the architecture behind the promise.