AI is getting cheaper fast: September 2026 in numbers

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AI got a lot cheaper in September 2026:

→ GPT-6.1 Sol matched GPT-6 Astra on DeepSWE at one-fifth the token price, 26 days later
→ GPT-6 Sol and Luna: 50% cheaper than GPT-5.6
→ Terminal-Bench Science: $5.47 per task (GPT-6.1 Sol) vs $23.80 (Astra)
→ Cached input: 95% off on GPT-6.1 Sol and Gemini 4 Argon
→ Claude Opus 5.5 costs 40% less to run than Opus 5

The real metric now: cost per finished task, not price per token. Slide 8: 3 ways to cut your bill.

I'm Pranjul Rathour, GenAI engineer from Kanpur. Want me to judge your hackathon or speak at your college? pranjulrathour.scult.in/invite

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Pranjul Rathour
Pranjul Rathour
GenAI engineer, Kanpur · 3x first-prize hackathon winner · campus mentor
I ship production RAG pipelines, fine-tune LLMs and build agentic AI products end to end. I lead engineering at SCULT INDIA for a 14-member team and have mentored 200+ students through TechVerse Enclave.
Open to: GenAI roles, hackathon judging, mentorship sessions and guest talks at colleges.
On stage, at hackathons and on campus
Walking a room through the products he has shipped
Walking a room through the products he has shipped
On the mic
On the mic
Pitching at CSJMU, Kanpur
Pitching at CSJMU, Kanpur

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