TL;DR — GPT-5.4 is half Opus 5's price on both sides ($2.50/$15 vs $5/$25 input, 40% less on output). 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 | | GPT-5.4 | OpenAI | $2.5 | $15 |
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
- GPT-5.4: $55.00
On this mix, GPT-5.4 is the cheaper column (1.8× gap). Your ratio will differ — run your own mix through the LLM cost calculator.
Choose Claude Opus 5 if
quality-critical agent chains and code: Opus 5's Aug 2026 repricing was specifically aimed at making frontier quality affordable at volume, and cache+batch discounts narrow the real-world gap.
Choose GPT-5.4 if
you want frontier-class capability at the lowest OpenAI price that still clears the bar — GPT-5.4 is the value pick between these two on list price alone.
Routing decision card
- List price favors GPT-5.4; effective price depends on cache habits — Anthropic's ~90% cached-input discount can invert the input math on stable-prefix workloads
- Route by task: code/agents to Opus 5, general reasoning to GPT-5.4 is a common split
- Re-run the numbers when Sonnet 5's promo ends — it competes with both from below
- 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.