Claude Sonnet 4.6 vs GPT-4o — Side-by-side pricing
Side-by-side API pricing and tokenizer details for Claude Sonnet 4.6 (Anthropic) and GPT-4o (OpenAI).
Side-by-side pricing
| Feature | Claude Sonnet 4.6 | GPT-4o |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input (per 1M tokens) | $3.00 | $2.50 |
| Output (per 1M tokens) | $15.00 | $10.00 |
| Context caching | Yes — 90% off cached tokens | No |
| Batch API discount | 50% off | 50% off |
| Context window | 1M tokens | 128K tokens |
| Tokenizer | Anthropic tokenizer | o200k_base (tiktoken) |
ⓘ GPT-4o: Deprecated by OpenAI. API access shuts down 2026-10-23; calls will error after that date. Prices are no longer listed on OpenAI's pricing page and could not be re-verified from a vendor source.
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 Sonnet 4.6
$4.5000
Input: $1.5000 +Output: $3.0000
GPT-4o
$3.2500
Input: $1.2500 +Output: $2.0000
GPT-4o is 28% cheaper for this workload — saving $1.2500 per month at this volume.
Frequently asked questions
No, GPT-4o is cheaper for the typical workload above. At $2.50/1M input and $10.00/1M output tokens, it costs $3.2500 versus $4.5000 for Claude Sonnet 4.6 — a 28% difference.
Claude Sonnet 4.6 supports a 1M token context window. GPT-4o supports a 128K token context window. A larger context window lets you include more text — documents, conversation history, or code — in a single API call.
Claude Sonnet 4.6 supports context caching (90% off repeated tokens). It offers a 50% Batch API discount. GPT-4o does not support context caching. It offers a 50% Batch API discount.
No, they use different tokenizers. Claude Sonnet 4.6 uses the Anthropic tokenizer, while GPT-4o 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 Sonnet 4.6 (Anthropic): $3 input / $15 output per 1M tokens. GPT-4o (OpenAI): $2.5 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 Sonnet 4.6 costs $12.6000 per 1M total tokens and GPT-4o costs $8.5000. GPT-4o is 33% cheaper for this pattern. For your exact ratio, paste a real prompt into the calculator above.
Claude Sonnet 4.6 has a 1M-token context window — approximately 750K words or ~3K pages of standard text. GPT-4o has a 128K-token context window — approximately 96K words or ~384 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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