Claude Opus 5 vs GPT-5.4 nano — Side-by-side pricing
Side-by-side API pricing and tokenizer details for Claude Opus 5 (Anthropic) and GPT-5.4 nano (OpenAI).
Side-by-side pricing
| Feature | Claude Opus 5 | GPT-5.4 nano |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input (per 1M tokens) | $5.00 | $0.200 |
| Output (per 1M tokens) | $25.00 | $1.25 |
| Context caching | Yes — 90% off cached tokens | Yes — 90% off cached tokens |
| Batch API discount | 50% off | 50% off |
| Context window | 1M tokens | 400K tokens |
| Tokenizer | Anthropic tokenizer (Opus 4.7+) | o200k_base (tiktoken) |
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
GPT-5.4 nano
$0.3500
Input: $0.1000 +Output: $0.2500
GPT-5.4 nano is 95% cheaper for this workload — saving $7.1500 per month at this volume.
Frequently asked questions
No, GPT-5.4 nano is cheaper for the typical workload above. At $0.200/1M input and $1.25/1M output tokens, it costs $0.3500 versus $7.5000 for Claude Opus 5 — a 95% difference.
Claude Opus 5 supports a 1M token context window. GPT-5.4 nano supports a 400K 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. GPT-5.4 nano supports context caching (90% off repeated tokens). It offers a 50% Batch API discount.
No, they use different tokenizers. Claude Opus 5 uses the Anthropic tokenizer (Opus 4.7+), while GPT-5.4 nano uses o200k_base (tiktoken). 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. GPT-5.4 nano (OpenAI): $0.2 input / $1.25 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 GPT-5.4 nano costs $1.0400. GPT-5.4 nano is 95% 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. GPT-5.4 nano has a 400K-token context window — approximately 300K words or ~1K 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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