Terminal-Bench 2.1terminalC++
Fix a release-only C++ heap crash
Repair a release-only C++ crash involving custom libstdc++ memory initialization while limiting edits to user.cpp and eliminating leaks.
custom-memory-heap-crash
Normalized profile
What this task asks for
Repair a release-only C++ crash involving custom libstdc++ memory initialization while limiting edits to user.cpp and eliminating leaks. Modify no existing file except /app/user.cpp. Work with both supplied debug and release libstdc++ builds. Eliminate the release-mode crash. Produce no Valgrind memory leaks.
Intent
- bug repair
- test and validation
Work surfaces
- memory management
- static initialization
Technology
- GCC
- libstdc++
- Valgrind
- custom allocators
Expected artifacts
- /app/user.cpp
What makes it difficult
- low-level memory safety and lifecycle debugging
Published evidence
Model × harness outcomes
Counts are tied to these exact configurations. Harnesses are not treated as equivalent across benchmarks.
- Models
- 13
- Configurations
- 20
- Trials
- 100
Showing 20 of 20 configurations
| Model | Harness | Effort | Result | Passes |
|---|---|---|---|---|
| claude-fable-5anthropic · 2026-06-07 | claude-code2.1.167 | xhigh | All passed | 5/5 |
| claude-fable-5anthropic · 2026-06-05 | terminus-22.0.0 | high | All passed | 5/5 |
| claude-opus-4-7anthropic · 2026-05-01 | claude-code2.1.123 | max | All passed | 5/5 |
| claude-opus-4-7anthropic · 2026-05-01 | terminus-22.0.0 | max | All passed | 5/5 |
| claude-opus-4-8anthropic · 2026-07-09 | claude-code2.1.205 | high | Mixed | 2/5 |
| claude-sonnet-5anthropic · 2026-07-09 | claude-code2.1.205 | high | Mixed | 3/5 |
| gemini-3-pro-previewgemini · 2026-05-01 | gemini-cli0.40.0 | high | All passed | 5/5 |
| gemini-3-pro-previewgemini · 2026-05-01 | terminus-22.0.0 | high | All passed | 5/5 |
| gemini-3.1-pro-previewgemini · 2026-05-05 | gemini-cli0.40.0 | high | Mixed2 errors | 3/5 |
| gemini-3.1-pro-previewgemini · 2026-05-05 | terminus-22.0.0 | high | All passed | 5/5 |
| glm-5.1zai · 2026-05-01 | claude-code2.1.123 | max | All passed | 5/5 |
| gpt-5.5openai · 2026-05-01 | codex0.125.0 | xhigh | All passed | 5/5 |
| gpt-5.5openai · 2026-05-01 | terminus-22.0.0 | xhigh | All passed | 5/5 |
| gpt-5.6-lunaopenai · 2026-07-10 | codex0.144.0 | max | Mixed | 4/5 |
| gpt-5.6-lunaopenai · 2026-07-11 | codex0.144.1 | max | Mixed | 4/5 |
| gpt-5.6-solopenai · 2026-07-10 | codex0.144.0 | max | Mixed | 3/5 |
| gpt-5.6-terraopenai · 2026-07-10 | codex0.144.0 | max | Mixed | 4/5 |
| gpt-5.6-terraopenai · 2026-07-11 | codex0.144.1 | max | Mixed | 3/5 |
| grok-4.5cursor · 2026-07-09 | cursor-cli2026.07.08-0c04a8a | default | All passed | 5/5 |
| muse-spark-1.1openai · 2026-07-09 | mini-swe-agent2.4.5 | xhigh | Mixed | 2/5 |