Claude 2.1vsGPT-5.3-Codex-Spark
Claude 2.1 | GPT-5.3-Codex-Spark | |
|---|---|---|
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 200k | 128k |
| Overview | ||
| Company | Anthropic | OpenAI |
| Release date | Nov 21 2023 | Feb 12 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Claude 2.1vsGemini 3.7 FlashGPT-5.3-Codex-SparkvsGemini 3.7 FlashClaude 2.1vsMuse GlimmerGPT-5.3-Codex-SparkvsMuse GlimmerClaude 2.1vsGrok 4.6GPT-5.3-Codex-SparkvsGrok 4.6Claude 2.1vsDeepSeek-V4-Pro-0813GPT-5.3-Codex-SparkvsDeepSeek-V4-Pro-0813Claude 2.1vsMistral Medium 3.5GPT-5.3-Codex-SparkvsMistral Medium 3.5Claude 2.1vsKimi K3GPT-5.3-Codex-SparkvsKimi K3
Frequently asked questions
Claude 2.1 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude 2.1 shipped 814 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Context windows are 200k (Claude 2.1) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Claude 2.1 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Claude 2.1 was released by Anthropic on Nov 21 2023.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Claude 2.1 has a 200k context window; GPT-5.3-Codex-Spark has 128k.