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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 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.

ModelA monthA messageSubscription or API?
GPT-6 Luna APIOpenAI1,76 PLN0,0018 PLNAPI is cheaperChatGPT Go at 31,20 PLN pays off from 17.776 messages a month
Mistral Small 4 APIMistral2,28 PLN0,0023 PLNNo chat subscription from this provider
DeepSeek V4.1 Flash APIDeepSeek4,56 PLN0,0046 PLNNo chat subscription from this provider
Mistral Large 3 APIMistral6,44 PLN0,0064 PLNNo chat subscription from this provider
Gemini 3.5 Flash-Lite APIGoogle7,61 PLN0,0076 PLNNo chat subscription from this provider
Grok Build 0.1 APIxAI10,53 PLN0,011 PLNAPI is cheaperGrok SuperGrok at 117 PLN pays off from 11.111 messages a month
Gemini 3.8 Flash APIGoogle13,16 PLN0,013 PLNNo chat subscription from this provider
Grok 4.3 APIxAI13,16 PLN0,013 PLNAPI is cheaperGrok SuperGrok at 117 PLN pays off from 8.888 messages a month
DeepSeek V4 Pro APIDeepSeek16,99 PLN0,017 PLNNo chat subscription from this provider
Claude Haiku 4.5 APIAnthropic17,55 PLN0,018 PLNAPI is cheaperClaude Pro at 78,81 PLN pays off from 4.490 messages a month
Grok 4.7 APIxAI25,74 PLN0,026 PLNAPI is cheaperGrok SuperGrok at 117 PLN pays off from 4.545 messages a month
Mistral Medium 3.5 APIMistral26,33 PLN0,026 PLNNo chat subscription from this provider
Claude Sonnet 5.5 APIAnthropic35,10 PLN0,035 PLNAPI is cheaperClaude Pro at 78,81 PLN pays off from 2.245 messages a month
GPT-6.1 Sol APIOpenAI35,10 PLN0,035 PLNSubscription is cheaperChatGPT Go at 31,20 PLN pays off from 888 messages a month
Gemini 3.1 Pro (Preview) APIGoogle39,78 PLN0,04 PLNNo chat subscription from this provider
Claude Opus 5.5 APIAnthropic70,21 PLN0,07 PLNAPI is cheaperClaude Pro at 78,81 PLN pays off from 1.122 messages a month
Claude Fable 5.1 APIAnthropic176 PLN0,18 PLNSubscription is cheaperClaude Pro at 78,81 PLN pays off from 449 messages a month
GPT-6 Astra APIOpenAI176 PLN0,18 PLNSubscription is cheaperChatGPT Go at 31,20 PLN pays off from 177 messages a month

  • 1. OpenAI

    GPT-6 Luna API

    Input, 1M tokens
    0,39 PLN
    0,10 US$
    Output, 1M tokens
    1,95 PLN
    0,50 US$
    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 05/10/2026

  • 2. Mistral

    Mistral Small 4 API

    Input, 1M tokens
    0,59 PLN
    0,15 US$
    Output, 1M tokens
    2,34 PLN
    0,60 US$
    • Cached input −90% (generic discount)

    Context window not shown on the pricing page.

    Source: mistral.ai, checked 05/10/2026

  • 3. DeepSeek

    DeepSeek V4.1 Flash API

    Input, 1M tokens
    1,17 PLN
    0,30 US$
    Output, 1M tokens
    4,68 PLN
    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

    Peak price. Off-peak: input $0.15, cached $0.003, output $0.60.

    Source: api-docs.deepseek.com, checked 05/10/2026

  • 4. Mistral

    Mistral Large 3 API

    Input, 1M tokens
    1,95 PLN
    0,50 US$
    Output, 1M tokens
    5,85 PLN
    1,50 US$
    • 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 05/10/2026

  • 5. Google

    Gemini 3.5 Flash-Lite API

    Input, 1M tokens
    1,17 PLN
    0,30 US$
    Output, 1M tokens
    9,75 PLN
    2,50 US$
    • Cached input $0.03 / 1M tokens
    • Stable release

    Context window not read on an official page.

    Source: ai.google.dev, checked 05/10/2026

  • 6. xAI

    Grok Build 0.1 API

    Input, 1M tokens
    3,90 PLN
    1 US$
    Output, 1M tokens
    7,80 PLN
    2 US$
    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 05/10/2026

  • 7. Google

    Gemini 3.8 Flash API

    Input, 1M tokens
    2,93 PLN
    0,75 US$
    Output, 1M tokens
    14,63 PLN
    3,75 US$
    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 05/10/2026

  • 8. xAI

    Grok 4.3 API

    Input, 1M tokens
    4,88 PLN
    1,25 US$
    Output, 1M tokens
    9,75 PLN
    2,50 US$
    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 05/10/2026

  • 9. DeepSeek

    DeepSeek V4 Pro API

    Input, 1M tokens
    5,15 PLN
    1,32 US$
    Output, 1M tokens
    15,45 PLN
    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

    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 05/10/2026

  • 10. Anthropic

    Claude Haiku 4.5 API

    Input, 1M tokens
    3,90 PLN
    1 US$
    Output, 1M tokens
    19,50 PLN
    5 US$
    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 05/10/2026

  • 11. xAI

    Grok 4.7 API

    Input, 1M tokens
    7,80 PLN
    2 US$
    Output, 1M tokens
    23,40 PLN
    6 US$
    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 05/10/2026

  • 12. Mistral

    Mistral Medium 3.5 API

    Input, 1M tokens
    5,85 PLN
    1,50 US$
    Output, 1M tokens
    29,25 PLN
    7,50 US$
    • 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 05/10/2026

  • 13. Anthropic

    Claude Sonnet 5.5 API

    Input, 1M tokens
    7,80 PLN
    2 US$
    Output, 1M tokens
    39,00 PLN
    10 US$
    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 05/10/2026

  • 14. OpenAI

    GPT-6.1 Sol API

    Input, 1M tokens
    7,80 PLN
    2 US$
    Output, 1M tokens
    39,00 PLN
    10 US$
    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 05/10/2026

  • 15. Google

    Gemini 3.1 Pro (Preview) API

    Input, 1M tokens
    7,80 PLN
    2 US$
    Output, 1M tokens
    46,80 PLN
    12 US$
    • 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 05/10/2026

  • 16. Anthropic

    Claude Opus 5.5 API

    Input, 1M tokens
    15,60 PLN
    4 US$
    Output, 1M tokens
    78,01 PLN
    20 US$
    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 05/10/2026

  • 17. Anthropic

    Claude Fable 5.1 API

    Input, 1M tokens
    39,00 PLN
    10 US$
    Output, 1M tokens
    195 PLN
    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

    Top tier above Opus. US-only inference (inference_geo us) costs 1.1x.

    Source: platform.claude.com, checked 05/10/2026

  • 18. OpenAI

    GPT-6 Astra API

    Input, 1M tokens
    39,00 PLN
    10 US$
    Output, 1M tokens
    195 PLN
    50 US$
    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 05/10/2026

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