GPT-5.5 Instant vs MiniCPM5-1B: Benchmarks, Pricing & Capabilities Compared
TL;DR — GPT-5.5 Instant wins for reasoning + long-context · MiniCPM5-1B wins for general use.
GPT-5.5 Instant OpenAI
- Released
- 2026-05-05
- Context window
- 400K tokens
- Input price
- $5.00 / Mtok
- Output price
- $30.00 / Mtok
MiniCPM5-1B OpenBMB
- Released
- 2026-05-25
- Context window
- 128K tokens
- Input price
- $0.00 / Mtok
- Output price
- $0.00 / Mtok
Benchmark comparison
| Benchmark | GPT-5.5 Instant | MiniCPM5-1B |
|---|---|---|
| AA Intelligence Index | 41.8 ✓ | 17.9 |
| GPQA Diamond | 84.6% ✓ | 26.9% |
| HLE | 20.3% ✓ | 4.6% |
| IF-Bench | 71.5% ✓ | 35.2% |
| LiveCodeBench Reasoning | 55.7% ✓ | 4.7% |
| SciCode | 50.3% ✓ | 1.4% |
| TAU2-bench | 49.4% | 82.5% ✓ |
| TerminalBench-Hard | 42.4% ✓ | 0.0% |
Pricing comparison
| Metric | GPT-5.5 Instant | MiniCPM5-1B |
|---|---|---|
| Input ($/Mtok) | $5.00 | $0.00 |
| Output ($/Mtok) | $30.00 | $0.00 |
| Cached input ($/Mtok) | — | — |
| Cost per 1M-token roundtrip (1M in + 1M out) | $35.00 | $0.00 |
Context window & modalities
| Attribute | GPT-5.5 Instant | MiniCPM5-1B |
|---|---|---|
| Context window | 400K tokens | 128K tokens |
| Input modalities | text, image | text |
| Output modalities | text | text |
| Knowledge cutoff | 2025-08-31 | — |
Verdict by use case
Coding
Insufficient data
Basis: SWE-bench
No shared coding benchmark.
Reasoning
→ GPT-5.5 Instant
Basis: GPQA Diamond
GPT-5.5 Instant 84.6% vs MiniCPM5-1B 26.9% on GPQA Diamond.
Math
Insufficient data
Basis: MATH / AIME
No shared math benchmark.
Long context
→ GPT-5.5 Instant
Basis: Context window
GPT-5.5 Instant 400K tokens vs MiniCPM5-1B 128K tokens.
Cost
→ MiniCPM5-1B
Basis: Input $/Mtok
GPT-5.5 Instant $5/Mtok vs MiniCPM5-1B $0/Mtok input.
Changelog & releases
GPT-5.5 Instant
Released 2026-05-05
MiniCPM5-1B
Released 2026-05-25