Cheapest language models in 2026: Prices, Context Windows and Features

Listed by price per million tokens (input plus output), lowest first.

1. 426 O

   o1

   OpenAI

   • Input $15/M
   • Output $60/M
   • Context 200K
   • Released 17 Dec 2024
   Details
2. 427 CO

   Claude Opus 4.1

   Anthropic

   • Input $15/M
   • Output $75/M
   • Context 200K
   • Released 5 Aug 2025
   Details
3. 428 G4

   GPT-4

   OpenAI

   • Input $30/M
   • Output $60/M
   • Context 8K
   • Released 28 May 2023
   Details
4. 429 G5

   GPT-5.2 Pro (batch)

   OpenAI

   • Input $10.5/M
   • Output $84/M
   • Context 400K
   • Released 10 Dec 2025
   Details
5. 430 OP

   o3 Pro

   OpenAI

   • Input $20/M
   • Output $80/M
   • Context 200K
   • Released 10 Jun 2025
   Details
6. 431 G5

   GPT-5.5 Pro (batch)

   OpenAI

   • Input $15/M
   • Output $90/M
   • Context 1.05M
   • Released 24 Apr 2026
   Details
7. 432 G5

   GPT-5.4 Pro (batch)

   OpenAI

   • Input $15/M
   • Output $90/M
   • Context 1.05M
   • Released 5 Mar 2026
   Details
8. 433 G5

   GPT-5 Pro

   OpenAI

   • Input $15/M
   • Output $120/M
   • Context 400K
   • Released 6 Oct 2025
   Details
9. 434 G5

   GPT-5.2 Pro

   OpenAI

   • Input $21/M
   • Output $168/M
   • Context 400K
   • Released 10 Dec 2025
   Details
10. 435 G5

    GPT-5.5 Pro

    OpenAI

    • Input $30/M
    • Output $180/M
    • Context 1.05M
    • Released 24 Apr 2026
    Details
11. 436 G5

    GPT-5.4 Pro

    OpenAI

    • Input $30/M
    • Output $180/M
    • Context 1.05M
    • Released 5 Mar 2026
    Details
12. 437 OP

    o1-pro

    OpenAI

    • Input $150/M
    • Output $600/M
    • Context 200K
    • Released 19 Mar 2025
    Details