Gemini 2.5 Flash (Reasoning) Token Counter & Cost Calculator
Count tokens for Gemini 2.5 Flash (Reasoning) and estimate the exact API cost — $0.30
per 1M input tokens, $2.50 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%): Google does not publish its tokenizer, so this count uses OpenAI's o200k_base as an approximation.
Cost lookup — Gemini 2.5 Flash (Reasoning)
| Tokens | Cost on Gemini 2.5 Flash (Reasoning) |
|---|---|
| 1K input tokens | 0.03¢ |
| 10K input tokens | 0.3¢ |
| 100K input tokens | $0.0300 |
| 1M input tokens | $0.3000 |
| 1K output tokens | 0.25¢ |
| 10K output tokens | $0.0250 |
FAQ
How accurate is the Gemini 2.5 Flash (Reasoning) token count?
Close estimate (±15%): Google 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 Gemini 2.5 Flash (Reasoning) API cost calculated?
Cost = (input tokens ÷ 1,000,000) × $0.30 + (output tokens ÷ 1,000,000) × $2.50 — Gemini 2.5 Flash (Reasoning)'s official per-1M-token prices from Artificial Analysis.
See full Gemini 2.5 Flash (Reasoning) pricing & benchmarks, or the main token counter for every model.