TL;DR — Gemini 3 Pro is roughly half GPT-5.4's input and a third its output ($1.25/$5 vs $2.50/$15). Every number below is from our weekly-verified pricing tracker (verified 2026-08-26).
Pricing side by side (per 1M tokens, USD)
| Model | Provider | Input | Output | |-------|----------|-------|--------| | GPT-5.4 | OpenAI | $2.5 | $15 | | Gemini 3 Pro | Google | $1.25 | $5 |
Verified 2026-08-26 against official rate cards — the tracker keeps the change log.
What a real month costs
At a standard workload of 10M input + 2M output tokens/month:
- GPT-5.4: $55.00
- Gemini 3 Pro: $22.50
On this mix, Gemini 3 Pro is the cheaper column (2.4× gap). Your ratio will differ — run your own mix through the LLM cost calculator.
Choose GPT-5.4 if
OpenAI ecosystem fit or task-specific quality on your evals — at 2–3× the price, GPT-5.4 must earn the premium per task, not by reputation.
Choose Gemini 3 Pro if
cost-efficient frontier reasoning: Gemini 3 Pro's rates changed what 'mid-tier price' means in 2026, and for many workloads it clears the same bar.
Routing decision card
- The 3× output gap dominates for generation-heavy work — Gemini's column wins most raw-price math
- Route by measured quality: keep GPT-5.4 for the task families where your evals show it ahead
- Both pair naturally with a same-vendor Flash/mini tier below them
- The router answer: most teams shouldn't hard-pick one — ClawRouters routes each request to whichever side fits it, so the comparison becomes a per-call decision instead of a bet.
Part of the LLM model comparison index. Prices move fast in 2026 — the tracker logs every change with dates.