token.app › Compare › GPT-5.6 Luna (batch) vs Mercury 3

GPT-5.6 Luna (batch) vs Mercury 3

Mercury 3 is 1.4× cheaper per token on a blended 3:1 basis. GPT-5.6 Luna (batch) accepts the larger context window (1.1M).

Head to head
Blended price uses a 3:1 input:output mix
GPT-5.6 Luna (batch)Mercury 3
ProviderOpenAIInception
Input $/1M$0.100$0.100
Output $/1M$0.600$0.350
Blended $/1M$0.225$0.163
Context window1.1M1M
Max output128K131K
ReleasedJul 2026Oct 2026
LicenceProprietaryProprietary
Choose GPT-5.6 Luna (batch) if…
  • Larger context window (1.1M)
Choose Mercury 3 if…
  • Costs less per token — $0.163 vs $0.225 blended
  • Newer model (released Oct 2026)
FAQ
Which is better, GPT-5.6 Luna (batch) or Mercury 3?
We do not hold independently-run benchmark scores covering both GPT-5.6 Luna (batch) and Mercury 3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is GPT-5.6 Luna (batch) cheaper than Mercury 3?
Mercury 3 is cheaper: $0.163 versus $0.225 per million tokens blended at 3:1 input:output. Input alone: $0.100 vs $0.100. Output alone: $0.600 vs $0.350.
What context windows do GPT-5.6 Luna (batch) and Mercury 3 have?
GPT-5.6 Luna (batch): 1,050,000 tokens. Mercury 3: 1,000,000 tokens.
Who makes GPT-5.6 Luna (batch) and Mercury 3?
GPT-5.6 Luna (batch) is made by OpenAI. Mercury 3 is made by Inception.
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