AI API prices per million tokens
Input and output token prices of OpenAI, Anthropic, Google, xAI, Mistral and DeepSeek models, converted at the ČNB rate, with a calculator: how much X messages a month cost, and when a subscription is cheaper.
Prices from official price lists, converted at the Czech National Bank rate of 02/10/2026. We check the price lists every week; a person confirms every change.
How much do I pay for the API?
Enter how many messages you send a month. A typical message is 1 500 tokens in (your question with context) and 600 tokens out (about 1 100 and 450 words). The table converts at the ČNB rate and compares with each provider's cheapest paid subscription.
| Model | A month | A message | Subscription or API? |
|---|---|---|---|
| GPT-6 Luna APIOpenAI | €0.40 | €0.0004 | API is cheaperChatGPT Go at €7.13 pays off from 17 785 messages a month |
| Mistral Small 4 APIMistral | €0.52 | €0.00052 | No chat subscription from this provider |
| DeepSeek V4.1 Flash APIDeepSeek | €1.04 | €0.001 | No chat subscription from this provider |
| Mistral Large 3 APIMistral | €1.47 | €0.0015 | No chat subscription from this provider |
| Gemini 3.5 Flash-Lite APIGoogle | €1.74 | €0.0017 | No chat subscription from this provider |
| Grok Build 0.1 APIxAI | €2.41 | €0.0024 | API is cheaperGrok SuperGrok at €26.73 pays off from 11 112 messages a month |
| Gemini 3.8 Flash APIGoogle | €3.01 | €0.003 | No chat subscription from this provider |
| Grok 4.3 APIxAI | €3.01 | €0.003 | API is cheaperGrok SuperGrok at €26.73 pays off from 8 890 messages a month |
| DeepSeek V4 Pro APIDeepSeek | €3.88 | €0.0039 | No chat subscription from this provider |
| Claude Haiku 4.5 APIAnthropic | €4.01 | €0.004 | API is cheaperClaude Pro at €18.00 pays off from 4 490 messages a month |
| Grok 4.7 APIxAI | €5.88 | €0.0059 | API is cheaperGrok SuperGrok at €26.73 pays off from 4 546 messages a month |
| Mistral Medium 3.5 APIMistral | €6.01 | €0.006 | No chat subscription from this provider |
| Claude Sonnet 5.5 APIAnthropic | €8.02 | €0.008 | API is cheaperClaude Pro at €18.00 pays off from 2 245 messages a month |
| GPT-6.1 Sol APIOpenAI | €8.02 | €0.008 | Subscription is cheaperChatGPT Go at €7.13 pays off from 889 messages a month |
| Gemini 3.1 Pro (Preview) APIGoogle | €9.09 | €0.0091 | No chat subscription from this provider |
| Claude Opus 5.5 APIAnthropic | €16.04 | €0.016 | API is cheaperClaude Pro at €18.00 pays off from 1 122 messages a month |
| Claude Fable 5.1 APIAnthropic | €40.09 | €0.04 | Subscription is cheaperClaude Pro at €18.00 pays off from 449 messages a month |
| GPT-6 Astra APIOpenAI | €40.09 | €0.04 | Subscription is cheaperChatGPT Go at €7.13 pays off from 177 messages a month |
1. OpenAI
GPT-6 Luna API
- Input, 1M tokens
- €0.09
- US$0.10
- Output, 1M tokens
- €0.45
- US$0.50
Context: 1 050 000- Cached input $0.01 / 1M tokens
- Cheapest, most efficient tier
Same >272K long-context caveat. Previous gpt-5.4-mini ($0.75/$4.50) and gpt-5.4-nano ($0.20/$1.25) are still listed.
2. Mistral
Mistral Small 4 API
- Input, 1M tokens
- €0.13
- US$0.15
- Output, 1M tokens
- €0.53
- US$0.60
- Cached input −90% (generic discount)
Context window not shown on the pricing page.
3. DeepSeek
DeepSeek V4.1 Flash API
- Input, 1M tokens
- €0.27
- US$0.30
- Output, 1M tokens
- €1.07
- US$1.20
Context: 1 000 000- Cached input $0.006 / 1M tokens (peak)
- Off-peak half price: input $0.15, output $0.60
- Max output 384K tokens
Peak price. Off-peak: input $0.15, cached $0.003, output $0.60.
4. Mistral
Mistral Large 3 API
- Input, 1M tokens
- €0.45
- US$0.50
- Output, 1M tokens
- €1.34
- US$1.50
- Open-weight model
- Cached input −90% (no per-model price shown)
- Batch at half price
Context window not shown on the pricing page.
5. Google
Gemini 3.5 Flash-Lite API
- Input, 1M tokens
- €0.27
- US$0.30
- Output, 1M tokens
- €2.23
- US$2.50
- Cached input $0.03 / 1M tokens
- Stable release
Context window not read on an official page.
6. xAI
Grok Build 0.1 API
- Input, 1M tokens
- €0.89
- US$1
- Output, 1M tokens
- €1.78
- US$2
Context: 256 000- Cached input $0.20 / 1M tokens
- Prompts from 200k: input $2 / output $4
Cheapest xAI model listed; positioning (coding?) not confirmed. From 200k tokens cached input is $0.40.
7. Google
Gemini 3.8 Flash API
- Input, 1M tokens
- €0.67
- US$0.75
- Output, 1M tokens
- €3.34
- US$3.75
Context: 1 048 576- Cached input $0.075 / 1M tokens
- Max output 65,536 tokens
Promotional price until 31 Dec 2026; from 1 Jan 2027 input $1.50, output $7.50, caching $0.15.
8. xAI
Grok 4.3 API
- Input, 1M tokens
- €1.11
- US$1.25
- Output, 1M tokens
- €2.23
- US$2.50
Context: 1 000 000- Cached input $0.20 / 1M tokens
- Prompts from 200k: input $2.50 / output $5
From 200k tokens cached input is $0.40.
9. DeepSeek
DeepSeek V4 Pro API
- Input, 1M tokens
- €1.18
- US$1.32
- Output, 1M tokens
- €3.53
- US$3.96
Context: 1 000 000- Cached input $0.044 / 1M tokens (peak)
- Off-peak half price: input $0.66, output $1.98
- Max output 384K tokens
Peak price (01–04 and 06–10 UTC Mon–Fri). Off-peak (other hours, weekends, Chinese holidays) is half: input $0.66, cached $0.022, output $1.98.
10. Anthropic
Claude Haiku 4.5 API
- Input, 1M tokens
- €0.89
- US$1
- Output, 1M tokens
- €4.45
- US$5
Context: 200 000- Cached input $0.10 / 1M tokens
- 200k token context
API id claude-haiku-4-5-20251001. Retirement not sooner than 15 Oct 2026 (watch for a successor).
11. xAI
Grok 4.7 API
- Input, 1M tokens
- €1.78
- US$2
- Output, 1M tokens
- €5.35
- US$6
Context: 500 000- Cached input $0.50 / 1M tokens
- Prompts from 200k: input $4 / output $12
From 200k tokens the higher rate (cached $1.00) applies to all tokens of the request.
12. Mistral
Mistral Medium 3.5 API
- Input, 1M tokens
- €1.34
- US$1.50
- Output, 1M tokens
- €6.68
- US$7.50
- Frontier-class, agentic and coding
- Cached input −90% (generic discount)
More expensive than Mistral Large 3. Context window not shown on the pricing page.
13. Anthropic
Claude Sonnet 5.5 API
- Input, 1M tokens
- €1.78
- US$2
- Output, 1M tokens
- €8.91
- US$10
Context: 1 000 000- Cached input $0.20 / 1M tokens
- No surcharge for long context
- Batch −50%
Cache write 5 min $2.50, 1 h $4.
14. OpenAI
GPT-6.1 Sol API
- Input, 1M tokens
- €1.78
- US$2
- Output, 1M tokens
- €8.91
- US$10
Context: 1 050 000- Cached input $0.10 / 1M tokens
- Near-Astra performance at lower cost
Same long-context caveat: input over 272K may be billed at double rates; not confirmed for this model.
15. Google
Gemini 3.1 Pro (Preview) API
- Input, 1M tokens
- €1.78
- US$2
- Output, 1M tokens
- €10.69
- US$12
- Cached input $0.20 / 1M tokens
- Prompts over 200k: input $4 / output $18
Preview status. Caching over 200k is $0.40. Context window not read on an official page.
16. Anthropic
Claude Opus 5.5 API
- Input, 1M tokens
- €3.56
- US$4
- Output, 1M tokens
- €17.82
- US$20
Context: 1 000 000- Cached input $0.20 / 1M tokens
- No surcharge for long context
- Fast mode $8 / $40; Batch −50%
Recommended default. Cache write 5 min $5, 1 h $8.
17. Anthropic
Claude Fable 5.1 API
- Input, 1M tokens
- €8.91
- US$10
- Output, 1M tokens
- €44.54
- US$50
Context: 1 000 000- Cached input $0.25 / 1M tokens
- Full 1M context at standard price
- Batch −50%; cache write 5 min $12.50, 1 h $20
Top tier above Opus. US-only inference (inference_geo us) costs 1.1x.
18. OpenAI
GPT-6 Astra API
- Input, 1M tokens
- €8.91
- US$10
- Output, 1M tokens
- €44.54
- US$50
Context: 1 050 000- Cached input $1.00 / 1M tokens
- Flagship, most capable model
Pricing page: input over 272K tokens is billed at double input/cache rates for models with long-context pricing; not confirmed for GPT-6 models.
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