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Step 5 Preview
Mercury 2.5
Mercury 2.5 is a proprietary model from Inception, released Sep 8, 2026. Its best result is #95 of 107 on MedCode with 31.33%. It costs $0.04 per million input tokens and $0.15 per million output tokens, with a 260K-token context window.
- Developer
- Inception
- Released
- Sep 8, 2026
- Context window
- 260K
- Price in / out, per 1M tokens
- $0.04 / $0.15
- Weights
- Proprietary
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| Terminal-Bench 4.0Coding | 0.00% | 55 / 55 | $0.37 | |
| Vibe Code BenchCoding | 3.68% | 104 / 115 | $0.38 | |
| Tax Agent BenchFinance | 2.49% | 76 / 76 | $0.02 | |
| Legal Research BenchLaw | 4.33% | 80 / 85 | $0.06 | |
| MedCodeMedicine | 31.33% | 95 / 107 | $0.2 / $0.75 | |
| Terminal-Bench ScienceReasoning | 0.00% | 39 / 42 | $0.18 |
Vals AI, as of Oct 24, 2026.
Compare Mercury 2.5
Inception
Builds Mercury, diffusion language models that generate text in parallel. Founded 2024, based in Palo Alto. inceptionlabs.ai
Questions
Who makes Mercury 2.5?
Mercury 2.5 is made by Inception, founded 2024 and based in Palo Alto.
How much does Mercury 2.5 cost?
$0.04 per million input tokens and $0.15 per million output tokens, at its provider’s list price.
What is Mercury 2.5’s context window?
260K tokens (260,000).
Is Mercury 2.5 open source?
No. Mercury 2.5 is proprietary and served through its provider’s API.