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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 10/5/2026. 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.

ModelA monthA messageSubscription or API?
GPT-6 Luna APIOpenAICZK 9.83CZK 0.0098API is cheaperChatGPT Go at CZK 175 pays off from 17,777 messages a month
Mistral Small 4 APIMistralCZK 12.77CZK 0.013API is cheaperVibe Pro at CZK 444 pays off from 34,737 messages a month
DeepSeek V4.1 Flash APIDeepSeekCZK 25.55CZK 0.026No chat subscription from this provider
Mistral Large 3 APIMistralCZK 36.03CZK 0.036API is cheaperVibe Pro at CZK 444 pays off from 12,316 messages a month
Gemini 3.5 Flash-Lite APIGoogleCZK 42.58CZK 0.043API is cheaperGemini Google AI Plus at CZK 150 pays off from 3,522 messages a month
Grok Build 0.1 APIxAICZK 58.95CZK 0.059API is cheaperGrok SuperGrok at CZK 655 pays off from 11,111 messages a month
Gemini 3.8 Flash APIGoogleCZK 73.69CZK 0.074API is cheaperGemini Google AI Plus at CZK 150 pays off from 2,035 messages a month
Grok 4.3 APIxAICZK 73.69CZK 0.074API is cheaperGrok SuperGrok at CZK 655 pays off from 8,888 messages a month
DeepSeek V4 Pro APIDeepSeekCZK 95.11CZK 0.095No chat subscription from this provider
Claude Haiku 4.5 APIAnthropicCZK 98.25CZK 0.098API is cheaperClaude Pro at CZK 440 pays off from 4,481 messages a month
Grok 4.7 APIxAICZK 144CZK 0.14API is cheaperGrok SuperGrok at CZK 655 pays off from 4,545 messages a month
Mistral Medium 3.5 APIMistralCZK 147CZK 0.15API is cheaperVibe Pro at CZK 444 pays off from 3,010 messages a month
Claude Sonnet 5.5 APIAnthropicCZK 197CZK 0.20API is cheaperClaude Pro at CZK 440 pays off from 2,240 messages a month
GPT-6.1 Sol APIOpenAICZK 197CZK 0.20Subscription is cheaperChatGPT Go at CZK 175 pays off from 888 messages a month
Gemini 3.1 Pro (Preview) APIGoogleCZK 223CZK 0.22Subscription is cheaperGemini Google AI Plus at CZK 150 pays off from 673 messages a month
Claude Opus 5.5 APIAnthropicCZK 393CZK 0.39API is cheaperClaude Pro at CZK 440 pays off from 1,120 messages a month
Claude Fable 5.1 APIAnthropicCZK 983CZK 0.98Subscription is cheaperClaude Pro at CZK 440 pays off from 448 messages a month
GPT-6 Astra APIOpenAICZK 983CZK 0.98Subscription is cheaperChatGPT Go at CZK 175 pays off from 177 messages a month

  • 1. OpenAI

    GPT-6 Luna API

    Input, 1M tokens
    CZK 2.18
    US$0.10
    Output, 1M tokens
    CZK 10.92
    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.

    Source: developers.openai.com, checked 10/5/2026

  • 2. Mistral

    Mistral Small 4 API

    Input, 1M tokens
    CZK 3.28
    US$0.15
    Output, 1M tokens
    CZK 13.10
    US$0.60
    • Cached input −90% (generic discount)

    Context window not shown on the pricing page.

    Source: mistral.ai, checked 10/5/2026

  • 3. DeepSeek

    DeepSeek V4.1 Flash API

    Input, 1M tokens
    CZK 6.55
    US$0.30
    Output, 1M tokens
    CZK 26.20
    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.

    Source: api-docs.deepseek.com, checked 10/5/2026

  • 4. Mistral

    Mistral Large 3 API

    Input, 1M tokens
    CZK 10.92
    US$0.50
    Output, 1M tokens
    CZK 32.75
    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.

    Source: mistral.ai, checked 10/5/2026

  • 5. Google

    Gemini 3.5 Flash-Lite API

    Input, 1M tokens
    CZK 6.55
    US$0.30
    Output, 1M tokens
    CZK 54.59
    US$2.50
    • Cached input $0.03 / 1M tokens
    • Stable release

    Context window not read on an official page.

    Source: ai.google.dev, checked 10/5/2026

  • 6. xAI

    Grok Build 0.1 API

    Input, 1M tokens
    CZK 21.83
    US$1
    Output, 1M tokens
    CZK 43.67
    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.

    Source: docs.x.ai, checked 10/5/2026

  • 7. Google

    Gemini 3.8 Flash API

    Input, 1M tokens
    CZK 16.38
    US$0.75
    Output, 1M tokens
    CZK 81.88
    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.

    Source: ai.google.dev, checked 10/5/2026

  • 8. xAI

    Grok 4.3 API

    Input, 1M tokens
    CZK 27.29
    US$1.25
    Output, 1M tokens
    CZK 54.59
    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.

    Source: docs.x.ai, checked 10/5/2026

  • 9. DeepSeek

    DeepSeek V4 Pro API

    Input, 1M tokens
    CZK 28.82
    US$1.32
    Output, 1M tokens
    CZK 86.46
    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.

    Source: api-docs.deepseek.com, checked 10/5/2026

  • 10. Anthropic

    Claude Haiku 4.5 API

    Input, 1M tokens
    CZK 21.83
    US$1
    Output, 1M tokens
    CZK 109
    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).

    Source: platform.claude.com, checked 10/5/2026

  • 11. xAI

    Grok 4.7 API

    Input, 1M tokens
    CZK 43.67
    US$2
    Output, 1M tokens
    CZK 131
    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.

    Source: docs.x.ai, checked 10/5/2026

  • 12. Mistral

    Mistral Medium 3.5 API

    Input, 1M tokens
    CZK 32.75
    US$1.50
    Output, 1M tokens
    CZK 164
    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.

    Source: mistral.ai, checked 10/5/2026

  • 13. Anthropic

    Claude Sonnet 5.5 API

    Input, 1M tokens
    CZK 43.67
    US$2
    Output, 1M tokens
    CZK 218
    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.

    Source: platform.claude.com, checked 10/5/2026

  • 14. OpenAI

    GPT-6.1 Sol API

    Input, 1M tokens
    CZK 43.67
    US$2
    Output, 1M tokens
    CZK 218
    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.

    Source: developers.openai.com, checked 10/5/2026

  • 15. Google

    Gemini 3.1 Pro (Preview) API

    Input, 1M tokens
    CZK 43.67
    US$2
    Output, 1M tokens
    CZK 262
    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.

    Source: ai.google.dev, checked 10/5/2026

  • 16. Anthropic

    Claude Opus 5.5 API

    Input, 1M tokens
    CZK 87.34
    US$4
    Output, 1M tokens
    CZK 437
    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.

    Source: platform.claude.com, checked 10/5/2026

  • 17. Anthropic

    Claude Fable 5.1 API

    Input, 1M tokens
    CZK 218
    US$10
    Output, 1M tokens
    CZK 1,092
    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.

    Source: platform.claude.com, checked 10/5/2026

  • 18. OpenAI

    GPT-6 Astra API

    Input, 1M tokens
    CZK 218
    US$10
    Output, 1M tokens
    CZK 1,092
    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.

    Source: developers.openai.com, checked 10/5/2026

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