Claude Opus 5 vs Gemini 2.5 Pro — Side-by-side pricing
Side-by-side API pricing and tokenizer details for Claude Opus 5 (Anthropic) and Gemini 2.5 Pro (Google).
Side-by-side pricing
| Feature | Claude Opus 5 | Gemini 2.5 Pro |
|---|---|---|
| Provider | Anthropic | |
| Input (per 1M tokens) | $5.00 | $1.25 |
| Output (per 1M tokens) | $25.00 | $10.00 |
| Long-context pricing | Flat rate at any prompt size | Over 200K tokens: $2.50 in / $15.00 out |
| Context caching | Yes — 90% off cached tokens | No |
| Batch API discount | 50% off | Not available |
| Context window | 1M tokens | 1M tokens |
| Tokenizer | Anthropic tokenizer (Opus 4.7+) | Gemini tokenizer |
Real-world cost example
1,000 API requests per month, each with 500 input tokens and 200 output tokens (500K input + 200K output total).
Claude Opus 5
$7.5000
Input: $2.5000 +Output: $5.0000
Gemini 2.5 Pro
$2.6250
Input: $0.6250 +Output: $2.0000
Gemini 2.5 Pro is 65% cheaper for this workload — saving $4.8750 per month at this volume.
Frequently asked questions
No, Gemini 2.5 Pro is cheaper for the typical workload above. At $1.25/1M input and $10.00/1M output tokens, it costs $2.6250 versus $7.5000 for Claude Opus 5 — a 65% difference. Note that Gemini 2.5 Pro switches to long-context pricing above 200K prompt tokens, so for very long prompts this gap does not scale linearly.
Claude Opus 5 supports a 1M token context window. Gemini 2.5 Pro supports a 1M token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.
Claude Opus 5 supports context caching (90% off repeated tokens). It offers a 50% Batch API discount. Gemini 2.5 Pro does not support context caching. It does not offer a batch API discount.
No, they use different tokenizers. Claude Opus 5 uses the Anthropic tokenizer (Opus 4.7+), while Gemini 2.5 Pro uses Gemini tokenizer. Different tokenizers split text differently, so the same prompt will produce different token counts on each model — the effective cost difference may be larger or smaller than the per-token price difference alone suggests.
Claude Opus 5 (Anthropic): $5 input / $25 output per 1M tokens. Gemini 2.5 Pro (Google): $1.25 input / $10 output per 1M tokens. Rates shown before caching or batch discounts.
For an 80% output / 20% input workload — typical for code generation or long-form writing — Claude Opus 5 costs $21.0000 per 1M total tokens and Gemini 2.5 Pro costs $8.2500. Gemini 2.5 Pro is 61% cheaper for this pattern. For your exact ratio, paste a real prompt into the calculator above.
Claude Opus 5 has a 1M-token context window — approximately 750K words or ~3K pages of standard text. Gemini 2.5 Pro has a 1M-token context window — approximately 750K words or ~3K pages. (Estimates assume ~0.75 words per token.)
Calculate costs for your actual prompt
Paste your prompt into the calculator and get exact token counts using each model's real tokenizer — all in your browser.
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