gpt-4-1 api-pricing code-generation model-deprecation

GPT-4.1 replaces GPT-4.5 with cheaper coding wins

GPT-4.1 nano costs $0.10/1M input tokens, hits 55% on SWE-Bench Verified, and deprecates GPT-4.5 Preview starting today.

June 11, 2026

Summary

Lower cost + no reasoning overhead makes GPT-4.1 the default choice for production coding agents and long-context workflows. GPT-4.5 removal forces immediate migration decisions for active users.

Why it matters

Lower cost + no reasoning overhead makes GPT-4.1 the default choice for production coding agents and long-context workflows. GPT-4.5 removal forces immediate migration decisions for active users.

Implementation verdict

Replaces GPT-4.5 Preview (fully off July 14). Requires no code changes if using API routing by model name. Worth switching now for cost savings on coding tasks; benchmark parity confirmed across Llama Index day-0 support. Deprecation deadline is hard—plan migration before June.

Sources

1.GPT-4.1-nano is the cheapest and fastest model released, costing $0.10/1M input ($0.03 cached) and $0.40/1M output
2.GPT-4.1 achieves 55% on SWE-Bench Verified without being a reasoning model
3.GPT-4.5 Preview in the API will be deprecated starting today and fully turned off on July 14
4.GPT-4.1 follows instructions more reliably than GPT-4o, particularly in format adherence, complying with negative instructions, and ordering
5.Llama Index now has day 0 support for GPT-4.1

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