GPT-4.1 vs GPT-4o: Pricing, Context Window & When to Upgrade (2026)
GPT-4.1 costs 20% less than GPT-4o and has an 8x larger context window. We compare pricing, performance scores, and real monthly costs to help you decide when to switch.
GPT-4.1 launched in April 2026 as a direct successor to GPT-4o — with a larger context window, lower price, and improved coding performance. If you're currently using GPT-4o, switching to GPT-4.1 cuts your input cost by 20% while getting more context. Here's exactly when the switch makes sense and when it doesn't.
GPT-4.1 vs GPT-4o: Pricing at a Glance
GPT-4.1 costs $2/1M input vs GPT-4o's $2.5/1M — a 20% saving on every input token. The context window jumps from 128k to 1M tokens, and the performance score is 6 points higher (88 vs 82). For most workloads, this is a straightforward upgrade.
The Context Window Is the Biggest Difference
GPT-4o has a 128k token context window — roughly 100,000 words. GPT-4.1 has a 1M token context window — roughly 750,000 words. That's a 7.8x increase. For applications that need to process entire codebases, long documents, or conversation histories, this is the deciding factor regardless of price.
Monthly Cost Comparison at Scale
At 1M requests/day with 500 input + 200 output tokens per request — a typical chatbot workload:
Where GPT-4.1 Wins Over GPT-4o
When GPT-4o Is Still the Right Choice
GPT-4o has stronger multimodal capabilities — vision, audio processing, and image understanding are more mature in GPT-4o than in GPT-4.1. If your application is primarily image or audio-based, GPT-4o may outperform GPT-4.1 on specific tasks. For text-only workloads, there is almost no reason to prefer GPT-4o over GPT-4.1 today.
What About GPT-4.1 Mini and GPT-4.1 Nano?
GPT-4.1 Mini at $0.4/1M is cheaper than GPT-4o Mini ($0.15/1M) and has 1M context vs 128k. For most teams currently on GPT-4o Mini, switching to GPT-4.1 Mini or Nano is the correct move — more context, same or lower cost.
Bottom Line
For any text-based workload, GPT-4.1 is a straightforward upgrade from GPT-4o: lower price, larger context, better coding performance. Migrate GPT-4o Mini users to GPT-4.1 Mini for additional cost savings with more context. Only stay on GPT-4o if your use case is heavily multimodal (vision/audio) and you've verified GPT-4o outperforms in your specific domain.
Use our token cost calculator to compare exact monthly costs at your token volumes, or see the full GPT-4o vs GPT-4.1 comparison →