Cheapest GPT-5, Claude & Gemini API in 2026 (Compared)

Everyone wants the smartest model at the lowest price. In 2026 the three frontier families — OpenAI's GPT, Anthropic's Claude and Google's Gemini — benchmark close enough that price becomes the deciding factor. And the gap between what you can pay and what you have to pay is enormous.

This guide compares the cheapest realistic ways to access GPT-5, Claude and Gemini, then shows how one reseller gateway undercuts all three official list prices by an order of magnitude.

The two prices that matter

Every LLM API bills on two numbers: the input price per million tokens and the output price per million tokens. Input is what you send; output is what the model generates. Output is almost always the expensive side, so a cheap input price is not a cheap model — you have to weigh both.

Official list prices are the sticker. They are not the floor. A reseller sources model access upstream and resells it with a much smaller margin, which is why reseller pricing can sit at roughly 5% of official — up to 95% lower — on the exact same models.

Official vs reseller: the real numbers

Here is a representative snapshot of the relationship between official list pricing and reseller display pricing, using the kind of rates you will see in a live catalog.

| Model | Official input · output (per 1M tokens) | zrouter input · output (per 1M tokens) | You save | | --- | --- | --- | --- | | GPT-5 | $85.60 · $246.91 | $4.28 · $12.35 | ~95% | | Claude | $40.00 · $100.00 | $2.00 · $5.00 | ~95% | | Gemini | $0.75 · $3.75 | $0.0375 · $0.1875 | ~95% |

These are display rates, not supplier costs — zcloud never exposes its margins or sourcing budget, only the price you pay and the official price it compares against. For the authoritative, always-current numbers, the token pricing index pulls every model's live input, output and savings percentage straight from the catalog.

Two things stand out. First, official GPT-5 pricing is dramatically higher than the other two, which means the potential savings are the largest there. Second, the reseller discount applies across all three families, so the "who is cheapest" question largely dissolves — you can pick the model for the task and pay a fraction of list for any of them.

Why GPT-5 is so expensive at list price

OpenAI's frontier GPT-5 list price anchors the high end of the market. Input and output costs scale directly with traffic, so a production app that runs millions of tokens a month sees a serious bill at official rates.

Through a reseller at roughly 5% of official, that same workload drops by an order of magnitude. Model quality is identical — it is the same model served from the same upstream — only the margin differs. That is the entire secret of reseller pricing: the model does not get cheaper to run, but the markup you pay is a fraction of the official margin.

Claude and Gemini: cheaper stickers, same discount

Claude and Gemini have lower official stickers than GPT-5 in many tiers, but the same reseller economics apply. Claude's long-context strength and Gemini's aggressive flash-tier pricing become even more compelling when the per-token cost is compressed by up to 95%.

This is where a single gateway shines. Instead of maintaining three accounts, three keys and three billing cycles, you point one OpenAI-compatible key at all three families and switch models by changing a single field. The OpenAI-compatible API guide explains the mechanics; the short version is that your existing SDK and tooling keep working with only a base-URL change.

How to actually get the cheapest GPT-5, Claude and Gemini

1. Create one key. Sign in to your workspace and generate a single API key — it works across GPT, Claude and Gemini alike.
2. Point your client at the gateway. Set your base URL to zcloud and keep your OpenAI-compatible code unchanged.
3. Fund with a prepaid token plan. Plans start at $1, so you can test a frontier model for less than the price of a coffee before committing more.
4. Watch the live numbers, not a stale table. The token pricing index and the pricing page show current per-model rates with no signup required.

The comparison that matters in 2026 is not "which frontier family is cheapest" — it is "which margin are you paying". At official list prices, all three are expensive. Through a reseller at roughly 5% of official, all three are cheap, and the smartest model becomes a pricing decision you no longer have to agonize over.

Frequently asked questions

Which is cheapest in 2026: GPT-5, Claude or Gemini? At official list prices, Gemini's smaller tiers are often cheapest, but the ranking shifts constantly. Through a reseller at roughly 5% of official, all three are dramatically cheaper than any official price, and the gap between them narrows.

Is output really more expensive than input? Yes. Generation is slower and heavier to serve than reading, so output tokens cost more. Always weigh output price heavily — it usually dominates real workloads.

Does the reseller discount change model quality? No. A reseller serves the same upstream models; only the margin differs. Output and quality are identical.

Where can I see the live prices? The zcloud token pricing index lists every model's input, output, official price and savings percentage, refreshed from the live catalog.