Claude Opus 5.5 vs MiniMax M3.1 Flash
| Spec | Claude Opus 5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Respan Index | 73.7 (#1) | 51.8 (#31) |
| Blended price per 1M | $4 | $0.131 |
| Context window | 1M | 1M |
| Input / output per 1M | $2 / $10 | $0.075 / $0.3 |
| Max output | 128K | - |
| Input | text, vision | text, vision, video |
| Released | 2026-09-22 | 2026-10-19 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Claude Opus 5.5 | MiniMax M3.1 Flash |
|---|---|---|
| Coding | 66.8 Claude Opus 5.5 | 40.7 MiniMax M3.1 Flash |
| Agents | 79.2 Claude Opus 5.5 | 56.3 MiniMax M3.1 Flash |
| Reasoning | 83.9 Claude Opus 5.5 | 55.4 MiniMax M3.1 Flash |
| Knowledge & language | 70.4 Claude Opus 5.5 | 54.0* MiniMax M3.1 Flash |
| Human preference | 61.4 Claude Opus 5.5 | 55.5 MiniMax M3.1 Flash |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Claude Opus 5.5 leads on 4 of the 4 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | Claude Opus 5.5 | MiniMax M3.1 Flash |
|---|---|---|
| SAGE 1.1 (Vals AI) | 91.3% | 85.3% |
| LMArena Agent (LMArena) | 0.2094 | -0.0396 |
| LMArena WebDev (LMArena) | 1810 | 1583 |
| Terminal-Bench 4.0 (Vals AI) | 65.2% | 25.3% |
FAQ
Is Claude Opus 5.5 better than MiniMax M3.1 Flash?
Claude Opus 5.5 scores 73.7 on the Respan Index (#1), ahead of MiniMax M3.1 Flash at 51.8 (#31). Claude Opus 5.5 leads on 4 of the 4 benchmarks both report.
Which is cheaper, Claude Opus 5.5 or MiniMax M3.1 Flash?
Claude Opus 5.5 lists at $2 input and $10 output per 1M tokens; MiniMax M3.1 Flash at $0.075 and $0.3. MiniMax M3.1 Flash is 30x cheaper per token at list price.
Which has the larger context window?
Both accept 1M tokens of context.