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Model comparison

GPT-5.5 Pro vs Grok 4.20

Not a benchmark table. This puts pricing, context, interface fit, and key visibility into one decision card.

Provider
OpenAI / xAI
global / global
Context
1M / 2M
text+image+file->text / text+image+file->text
Input price
$30.00 / $3.00
per 1M tokens
Output price
$180.00 / $15.00
per 1M tokens
Left model
GPT-5.5 Pro
OpenAI
FamilyGPT-5.5
Modalitytext+image+file->text

高阶专业版追踪位,适合企业级重度编码、研究与复杂代理工作流。

Right model
Grok 4.20
xAI
FamilyGrok
Modalitytext+image+file->text

超长上下文与多代理场景热度很高,适合海外品牌词流量承接。

Comparison summary

How to choose first

This is a cross-provider comparison. Start with the job boundary, then verify what your key can actually see.

On the listed price snapshot, Grok 4.20 is cheaper on combined input and output, but real routing, discounts, and limits still matter.

Grok 4.20 has the larger context window, which helps with long documents, knowledge bases, logs, and multi-turn workflows.

Decision boundary

Do not start with which model is absolutely stronger. Start with the boundary: cost, context, speed, quality, ecosystem, or supply stability.

  • GPT-5.5 Pro is worth checking first when the GPT-5.5 family, 1M context, and text+image+file->text capability match the job.
  • Grok 4.20 is worth checking first when the Grok family, 2M context, and text+image+file->text capability match the job.

Key checking route

If you already hold a key, the valuable check is provider identity, callable models, and whether balance, limits, or subscription status are visible.

  • OpenAI: GPT-5.5 Pro, GPT-5.5, text+image+file->text
  • xAI: Grok 4.20, Grok, text+image+file->text

Commercial fit

Commercially, do not look at model names alone. Combine price, limits, region, upstream stability, and ongoing monitoring.

  • GPT-5.5 Pro: 高阶专业版追踪位,适合企业级重度编码、研究与复杂代理工作流。
  • Grok 4.20: 超长上下文与多代理场景热度很高,适合海外品牌词流量承接。