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 | 9,81 CZK | 0,0098 CZK | API is cheaperChatGPT Go at 174 CZK pays off from 17 777 messages a month |
| Mistral Small 4 APIMistral | 12,75 CZK | 0,013 CZK | API is cheaperVibe Pro at 444 CZK pays off from 34 807 messages a month |
| DeepSeek V4.1 Flash APIDeepSeek | 25,50 CZK | 0,026 CZK | No chat subscription from this provider |
| Mistral Large 3 APIMistral | 35,96 CZK | 0,036 CZK | API is cheaperVibe Pro at 444 CZK pays off from 12 340 messages a month |
| Gemini 3.5 Flash-Lite APIGoogle | 42,50 CZK | 0,043 CZK | API is cheaperGemini Google AI Plus at 150 CZK pays off from 3 529 messages a month |
| Grok Build 0.1 APIxAI | 58,85 CZK | 0,059 CZK | API is cheaperGrok SuperGrok at 654 CZK pays off from 11 111 messages a month |
| Gemini 3.8 Flash APIGoogle | 73,56 CZK | 0,074 CZK | API is cheaperGemini Google AI Plus at 150 CZK pays off from 2 039 messages a month |
| Grok 4.3 APIxAI | 73,56 CZK | 0,074 CZK | API is cheaperGrok SuperGrok at 654 CZK pays off from 8 888 messages a month |
| DeepSeek V4 Pro APIDeepSeek | 94,94 CZK | 0,095 CZK | No chat subscription from this provider |
| Claude Haiku 4.5 APIAnthropic | 98,08 CZK | 0,098 CZK | API is cheaperClaude Pro at 440 CZK pays off from 4 490 messages a month |
| Grok 4.7 APIxAI | 144 CZK | 0,14 CZK | API is cheaperGrok SuperGrok at 654 CZK pays off from 4 545 messages a month |
| Mistral Medium 3.5 APIMistral | 147 CZK | 0,15 CZK | API is cheaperVibe Pro at 444 CZK pays off from 3 016 messages a month |
| Claude Sonnet 5.5 APIAnthropic | 196 CZK | 0,20 CZK | API is cheaperClaude Pro at 440 CZK pays off from 2 245 messages a month |
| GPT-6.1 Sol APIOpenAI | 196 CZK | 0,20 CZK | Subscription is cheaperChatGPT Go at 174 CZK pays off from 888 messages a month |
| Gemini 3.1 Pro (Preview) APIGoogle | 222 CZK | 0,22 CZK | Subscription is cheaperGemini Google AI Plus at 150 CZK pays off from 674 messages a month |
| Claude Opus 5.5 APIAnthropic | 392 CZK | 0,39 CZK | API is cheaperClaude Pro at 440 CZK pays off from 1 122 messages a month |
| Claude Fable 5.1 APIAnthropic | 981 CZK | 0,98 CZK | Subscription is cheaperClaude Pro at 440 CZK pays off from 449 messages a month |
| GPT-6 Astra APIOpenAI | 981 CZK | 0,98 CZK | Subscription is cheaperChatGPT Go at 174 CZK pays off from 177 messages a month |
1. OpenAI
GPT-6 Luna API
- Input, 1M tokens
- 2,18 CZK
- 0,10 $US
- Output, 1M tokens
- 10,90 CZK
- 0,50 $US
Context: 1 050 000- Cached input $0.01 / 1M tokens
- Cheapest, most efficient tier
2. Mistral
Mistral Small 4 API
- Input, 1M tokens
- 3,27 CZK
- 0,15 $US
- Output, 1M tokens
- 13,08 CZK
- 0,60 $US
- Cached input −90% (generic discount)
3. DeepSeek
DeepSeek V4.1 Flash API
- Input, 1M tokens
- 6,54 CZK
- 0,30 $US
- Output, 1M tokens
- 26,15 CZK
- 1,20 $US
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
4. Mistral
Mistral Large 3 API
- Input, 1M tokens
- 10,90 CZK
- 0,50 $US
- Output, 1M tokens
- 32,69 CZK
- 1,50 $US
- Open-weight model
- Cached input −90% (no per-model price shown)
- Batch at half price
5. Google
Gemini 3.5 Flash-Lite API
- Input, 1M tokens
- 6,54 CZK
- 0,30 $US
- Output, 1M tokens
- 54,49 CZK
- 2,50 $US
- Cached input $0.03 / 1M tokens
- Stable release
6. xAI
Grok Build 0.1 API
- Input, 1M tokens
- 21,80 CZK
- 1 $US
- Output, 1M tokens
- 43,59 CZK
- 2 $US
Context: 256 000- Cached input $0.20 / 1M tokens
- Prompts from 200k: input $2 / output $4
7. Google
Gemini 3.8 Flash API
- Input, 1M tokens
- 16,35 CZK
- 0,75 $US
- Output, 1M tokens
- 81,73 CZK
- 3,75 $US
Context: 1 048 576- Cached input $0.075 / 1M tokens
- Max output 65,536 tokens
8. xAI
Grok 4.3 API
- Input, 1M tokens
- 27,24 CZK
- 1,25 $US
- Output, 1M tokens
- 54,49 CZK
- 2,50 $US
Context: 1 000 000- Cached input $0.20 / 1M tokens
- Prompts from 200k: input $2.50 / output $5
9. DeepSeek
DeepSeek V4 Pro API
- Input, 1M tokens
- 28,77 CZK
- 1,32 $US
- Output, 1M tokens
- 86,31 CZK
- 3,96 $US
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
10. Anthropic
Claude Haiku 4.5 API
- Input, 1M tokens
- 21,80 CZK
- 1 $US
- Output, 1M tokens
- 109 CZK
- 5 $US
Context: 200 000- Cached input $0.10 / 1M tokens
- 200k token context
11. xAI
Grok 4.7 API
- Input, 1M tokens
- 43,59 CZK
- 2 $US
- Output, 1M tokens
- 131 CZK
- 6 $US
Context: 500 000- Cached input $0.50 / 1M tokens
- Prompts from 200k: input $4 / output $12
12. Mistral
Mistral Medium 3.5 API
- Input, 1M tokens
- 32,69 CZK
- 1,50 $US
- Output, 1M tokens
- 163 CZK
- 7,50 $US
- Frontier-class, agentic and coding
- Cached input −90% (generic discount)
13. Anthropic
Claude Sonnet 5.5 API
- Input, 1M tokens
- 43,59 CZK
- 2 $US
- Output, 1M tokens
- 218 CZK
- 10 $US
Context: 1 000 000- Cached input $0.20 / 1M tokens
- No surcharge for long context
- Batch −50%
14. OpenAI
GPT-6.1 Sol API
- Input, 1M tokens
- 43,59 CZK
- 2 $US
- Output, 1M tokens
- 218 CZK
- 10 $US
Context: 1 050 000- Cached input $0.10 / 1M tokens
- Near-Astra performance at lower cost
15. Google
Gemini 3.1 Pro (Preview) API
- Input, 1M tokens
- 43,59 CZK
- 2 $US
- Output, 1M tokens
- 262 CZK
- 12 $US
- Cached input $0.20 / 1M tokens
- Prompts over 200k: input $4 / output $18
16. Anthropic
Claude Opus 5.5 API
- Input, 1M tokens
- 87,18 CZK
- 4 $US
- Output, 1M tokens
- 436 CZK
- 20 $US
Context: 1 000 000- Cached input $0.20 / 1M tokens
- No surcharge for long context
- Fast mode $8 / $40; Batch −50%
17. Anthropic
Claude Fable 5.1 API
- Input, 1M tokens
- 218 CZK
- 10 $US
- Output, 1M tokens
- 1 090 CZK
- 50 $US
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
18. OpenAI
GPT-6 Astra API
- Input, 1M tokens
- 218 CZK
- 10 $US
- Output, 1M tokens
- 1 090 CZK
- 50 $US
Context: 1 050 000- Cached input $1.00 / 1M tokens
- Flagship, most capable model
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