計算ツール トークンカウンター よくある質問
English料金更新日 Aug 21, 2026

LLM API 料金計算ツール 2026

OpenAI・Anthropic・Google・xAI・DeepSeek・Mistral・Metaの28モデルのトークン単価を比較し、プロンプトキャッシュ・バッチ割引込みの実際の月額を試算しましょう。

1 · ワークロードを入力

プロンプトキャッシュ命中率 0%

2 · モデル別の月額コスト比較

ベンダー モデル コンテキスト 入力 $/1M 出力 $/1M リクエスト単価 月額 ▲
𝕏 Share

キャッシュ命中分の入力は各ベンダーのキャッシュ単価(入力の約10%)で計算されます。キャッシュ単価が非公開のモデルはスライダーの影響を受けません。バッチ−50%は対応モデルの入出力両方に適用。Claude Sonnet 5は2026年8月31日までプロモーション価格(通常 $3/$15)です。

トークンカウンター — テキストを貼り付けてトークン数を推定

0≈ トークン (文字 ÷ 4)
0単語
0文字

英語の目安は1トークン ≈ 4文字 ≈ 0.75語。日本語・韓国語・コードは文字あたりのトークン数が多くなります。正確な値は各モデルのトークナイザーに依存します。

How LLM API pricing works in 2026

Every major AI provider bills by the token — roughly a word fragment. You pay separately for input tokens (your prompt, system message, retrieved context) and output tokens (the model's reply). Output tokens cost 2–6× more than input tokens, so long-form generation is what really drives your bill.

Two discounts matter more than the sticker price. Prompt caching bills repeated prompt prefixes (system prompts, few-shot examples, long documents) at about 10% of the normal input rate — a chatbot with a 3,000-token system prompt saves dramatically at scale. The Batch API gives roughly 50% off both directions when you can wait minutes-to-hours for results, which suits evals, ETL and bulk summarization.

The spread between models is enormous: as of August 2026, a million output tokens runs from about $0.05 (Llama 3.1 8B via providers) to $180 (GPT‑5.5 Pro) — a 3,600× range. Picking the smallest model that clears your quality bar is the single biggest cost lever, ahead of caching, batching, or prompt trimming.

Frequently asked questions

How much does the GPT‑5.6 API cost?
As of August 2026, per million tokens: GPT‑5.6 Sol $5 in / $30 out, GPT‑5.6 Terra $2 / $12, GPT‑5.6 Luna $0.20 / $1.20. Cached input bills at ~10% of the input rate, and the Batch API takes a further 50% off.
How much does the Claude API cost?
Anthropic prices Claude Fable 5 at $10 / $50 per million tokens, Claude Opus 5 at $5 / $25, Claude Sonnet 5 at $2 / $10 (promo through Aug 31, 2026; standard $3 / $15), and Claude Haiku 4.5 at $1 / $5.
What's the cheapest LLM API right now?
For rock-bottom cost: Llama 3.1 8B via inference providers (~$0.02 / $0.05), DeepSeek V4 Flash ($0.14 / $0.28), Gemini 2.5 Flash‑Lite ($0.10 / $0.40), or GPT‑5.6 Luna ($0.20 / $1.20). Use the calculator above to see which is cheapest for your input/output mix.
How many tokens is 1,000 words?
Roughly 1,330 tokens for English prose (1 token ≈ 0.75 words). CJK languages and source code usually tokenize less efficiently, so budget extra.
Do caching and batch discounts stack?
Provider-dependent. Some allow batch requests to also hit the prompt cache; others don't. This calculator applies both when toggled, as an optimistic estimate — check your provider's docs before committing.
Where do these prices come from?
Compiled from providers' public pricing pages and reputable trackers, last verified on the date shown in the header. Prices change often — always confirm on the official pricing page before signing a contract.

Go deeper

Claude API pricing
Every Anthropic model's current rates. OpenAI API pricing
GPT-5.6 Sol, Terra, Luna and the full lineup. Gemini API pricing
Google's tiers, incl. the long-context surcharge. Claude vs GPT
Tier-by-tier cost comparison with caching factored in. Cheapest LLM APIs
The 2026 budget leaderboard — and when cheap is enough. Prompt caching guide
The 90% discount most teams leave on the table.