Model comparison

GPT-4.1 vs GPT-5.1-Codex

Compare OpenAI: GPT-4.1 (OpenAI) and OpenAI: GPT-5.1-Codex (OpenAI) by price, context, capabilities, and latency.

Estimate costAll comparisons

Which should you pick?

  • Price: OpenAI: GPT-4.1 is cheaper ($0.289 / 1M tokens input / $1.16 / 1M tokens output) vs OpenAI: GPT-5.1-Codex ($0.236 / 1M tokens input / $1.88 / 1M tokens output).
  • Context: OpenAI: GPT-4.1 has the larger context window (1M tokens).

Side by side

OpenAI: GPT-4.1 vs OpenAI: GPT-5.1-Codex — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

ModelProviderInputOutputContextCapabilitiesBest forLatencyStatusSource
OpenAI: GPT-4.1openai/gpt-4.1OpenAI$0.289 / 1M tokens$1.16 / 1M tokens1M
StreamingTool callingJSON modeVision
image understanding, multimodal chat1000-3000msCatalogPlatform curated
OpenAI: GPT-5.1-Codexopenai/gpt-5.1-codexOpenAI$0.236 / 1M tokens$1.88 / 1M tokens400k
StreamingTool callingJSON modeVision
image understanding, multimodal chat1000-3000msCatalogPlatform curated

FAQ

OpenAI: GPT-4.1 vs OpenAI: GPT-5.1-Codex FAQ

Is OpenAI: GPT-4.1 or OpenAI: GPT-5.1-Codex cheaper?

OpenAI: GPT-4.1 is cheaper ($0.289 / 1M tokens input / $1.16 / 1M tokens output) vs OpenAI: GPT-5.1-Codex ($0.236 / 1M tokens input / $1.88 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, OpenAI: GPT-4.1 or OpenAI: GPT-5.1-Codex?

OpenAI: GPT-4.1 is larger (1M tokens) vs 400k tokens.

OpenAI: GPT-4.1 vs OpenAI: GPT-5.1-Codex for Vision: which should I pick?

Both target Vision. Pick OpenAI: GPT-4.1 to optimize cost, or OpenAI: GPT-4.1 for the longer context window. Test both on real prompts before committing production traffic.

OpenAI: GPT-4.1 detailsOpenAI: GPT-5.1-Codex detailsPricing calculatorOpenAI-compatible quickstart