token.app › Compare › GPT-5.1-Codex-Mini vs Mercury 3

GPT-5.1-Codex-Mini vs Mercury 3

Mercury 3 is 4.2× cheaper per token on a blended 3:1 basis. Mercury 3 accepts the larger context window (1M).

Head to head
Blended price uses a 3:1 input:output mix
GPT-5.1-Codex-MiniMercury 3
ProviderOpenAIInception
Input $/1M$0.250$0.100
Output $/1M$2.00$0.350
Blended $/1M$0.688$0.163
Context window400K1M
Max output128K131K
ReleasedNov 2025Oct 2026
LicenceProprietaryProprietary
Choose GPT-5.1-Codex-Mini if…
  • No clear advantage on the data we hold.
Choose Mercury 3 if…
  • Costs less per token — $0.163 vs $0.688 blended
  • Larger context window (1M)
  • Newer model (released Oct 2026)
FAQ
Which is better, GPT-5.1-Codex-Mini or Mercury 3?
We do not hold independently-run benchmark scores covering both GPT-5.1-Codex-Mini and Mercury 3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is GPT-5.1-Codex-Mini cheaper than Mercury 3?
Mercury 3 is cheaper: $0.163 versus $0.688 per million tokens blended at 3:1 input:output. Input alone: $0.250 vs $0.100. Output alone: $2.00 vs $0.350.
What context windows do GPT-5.1-Codex-Mini and Mercury 3 have?
GPT-5.1-Codex-Mini: 400,000 tokens. Mercury 3: 1,000,000 tokens.
Who makes GPT-5.1-Codex-Mini and Mercury 3?
GPT-5.1-Codex-Mini is made by OpenAI. Mercury 3 is made by Inception.
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