TL;DR — Gemini 3 Pro undercuts Opus 5 by 4–5× ($1.25/$5 vs $5/$25) — the widest quality-tier price gap in this series. 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 | |-------|----------|-------|--------| | Claude Opus 5 | Anthropic | $5 | $25 | | 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:
- Claude Opus 5: $100.00
- Gemini 3 Pro: $22.50
On this mix, Gemini 3 Pro is the cheaper column (4.4× gap). Your ratio will differ — run your own mix through the LLM cost calculator.
Choose Claude Opus 5 if
top-shelf output quality on agent and code workloads is worth a 4× premium for the slice of traffic that needs it — and cache/batch discounts soften the sticker.
Choose Gemini 3 Pro if
value-frontier is the strategy: Gemini 3 Pro at $1.25/$5 delivers serious capability at Haiku-class prices, which is why it anchors the value tier in most routing pools.
Routing decision card
- These two rarely compete head-to-head in a tuned router — they occupy different rungs of the same ladder
- Common pattern: Gemini 3 Pro as reasoning default, Opus 5 as escalation — blended cost stays near the bottom rung
- The 4–5× gap is the routing opportunity: every request correctly kept on Gemini is ~75–80% saved
- 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.
Per-model detail: Claude Opus 5 deep dive
Part of the LLM model comparison index. Prices move fast in 2026 — the tracker logs every change with dates.