Claude Opus 4.8 (Adaptive Reasoning, Max Effort) Token Counter & Cost Calculator
Count tokens for Claude Opus 4.8 (Adaptive Reasoning, Max Effort) and estimate the exact API cost — $5.00
per 1M input tokens, $25.00 per 1M output tokens — using a real
o200k_base BPE tokenizer. Everything runs in your browser; nothing is uploaded.
Counts are exact for OpenAI models (o200k_base is GPT-4o/4.1/5's tokenizer). For Claude, Gemini and other vendors — whose tokenizers are not public — treat the count as a close estimate (typically within ±15%).
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Cost of this text across popular models
| Model | Input $/1M | Output $/1M | This text (input) | +500 output tokens |
|---|
Close estimate (±15%): Anthropic does not publish its tokenizer, so this count uses OpenAI's o200k_base as an approximation.
Cost lookup — Claude Opus 4.8 (Adaptive Reasoning, Max Effort)
| Tokens | Cost on Claude Opus 4.8 (Adaptive Reasoning, Max Effort) |
|---|---|
| 1K input tokens | 0.5¢ |
| 10K input tokens | $0.0500 |
| 100K input tokens | $0.5000 |
| 1M input tokens | $5.00 |
| 1K output tokens | $0.0250 |
| 10K output tokens | $0.2500 |
FAQ
How accurate is the Claude Opus 4.8 (Adaptive Reasoning, Max Effort) token count?
Close estimate (±15%): Anthropic does not publish its tokenizer, so this count uses OpenAI's o200k_base as an approximation. Paste your own text above to see the exact number for your prompt.
How is Claude Opus 4.8 (Adaptive Reasoning, Max Effort) API cost calculated?
Cost = (input tokens ÷ 1,000,000) × $5.00 + (output tokens ÷ 1,000,000) × $25.00 — Claude Opus 4.8 (Adaptive Reasoning, Max Effort)'s official per-1M-token prices from Artificial Analysis.
See full Claude Opus 4.8 (Adaptive Reasoning, Max Effort) pricing & benchmarks, or the main token counter for every model.