GPT-5 vs Inception: Mercury 2
Compare GPT-5 by OpenAI against Inception: Mercury 2 by Inception, context windows of 400K vs 128K, tested across 51 shared challenges. Updated April 2026.
Which is better, GPT-5 or Inception: Mercury 2?
GPT-5 and Inception: Mercury 2 are both competitive models. GPT-5 costs $1.25/M input tokens vs $0.25/M for Inception: Mercury 2. Context windows: 400K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between GPT-5 and Inception: Mercury 2
GPT-5 is made by openai while Inception: Mercury 2 is from inception. GPT-5 has a 400K token context window compared to Inception: Mercury 2's 128K. On pricing, GPT-5 costs $1.25/M input tokens vs $0.25/M for Inception: Mercury 2.
Per 1M tokens
Inception: Mercury 2 is cheaper on both — 5.0× input, 13× output
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, bigger context window, major provider backing.
Inception: Mercury 2 is 13x cheaper per token — worth considering if cost matters.
Style Comparison
Inception: Mercury 2 uses 8.2x more emoji
