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docs: release notes for 26.08 #1638

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docs: add release notes for 26.08
ramakrishnap-nv Jul 29, 2026
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docs: regenerate 26.08 release notes from script output
ramakrishnap-nv Jul 29, 2026
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Update RELEASE-NOTES.md
ramakrishnap-nv Jul 30, 2026
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chris-maes Jul 31, 2026
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# Release Notes

## Release Notes 26.08

### New Features (26.08)

- New Multi-GPU PDLP: distribute LP solves across multiple GPUs using METIS partitioning; 2.5x–8.8x speedup on 8 NVLink-connected B200 GPUs
- Exploit sparsity in Barrier's augmented system on problems with large second order cone constraints
- New free-format MPS parser with faster parse time on large models
- New recursive RINS heuristic for MIP
- New zero-half (odd-cycle) cuts for MIP
- New vector length diving and Farkas diving heuristics for MIP
- Routing: accept NumPy and pandas inputs in the routing Python `DataModel` in addition to cuDF
- C API: extend getters with additional query functions
- C API: automatic CPU/GPU memory selection for problem construction
- gRPC: Python interface to the C++ gRPC async client
- gRPC: allow TLS arguments in the Python gRPC async API
- UBI10 (Red Hat Universal Base Image) container variant for FIPS 140-3 compliant environments; image tags use `-ubi10` suffix (e.g. `latest-cu13-ubi10`)

### Breaking Changes (26.08)

- Routing `DataModel` now defers GPU device construction to solve time; applications that accessed device-side data between `DataModel` construction and the solve call must be updated

### Improvements (26.08)

- Conflict graph improvements: incorporate non-binary rows and probing implications
- Reduce latency in LP concurrent mode
- Reduce memory footprint of PDLP
- Reduce QP solver overhead
- Improve Ruiz equilibration heuristic to also check column imbalance on QPs
- Run feasibility-jump (CPU-FJ) heuristics at the root node
- Papilo-based primal/dual crush in MIP presolve
- Expose diving hyperparameters for MIP solver configuration
- Unify threading model in the MIP solver using OpenMP tasks
- MIP log cleanup and improved readability
- Add short `cu12`/`cu13` Docker tag aliases
- Remove `cuda-python` as an explicit dependency
- gRPC: `objective_scaling_factor` is now optional in requests
- gRPC: assign workers to distinct GPUs via `cudaSetDevice`

### Bug Fixes (26.08)

- Allow zero-valued coefficient updates in the LP Python model
- Fix an issue in PDLP with cublas error capture and hang on infeasible solutions
- Fix an exception in concurrent LP cleanup
- Fix bug in barrier solver where cuDSS descriptors were being freed before their backing buffers
- Fix a bug in MIP where the lower bound was incorrect when using a single thread
- Fix a bug in MIP where nodes were lost in branch and bound
- Fix a bug in MIP where root cut pass CPU feasibility-jump solutions were dropped by GPU heuristics
- Add guard in MIP for huge bounds in bounds propagation
- Fix a bug in MIP with incorrect GF2 presolve constraint addressing
- Fix a bug in MIP in variable fixing for initial solutions
- Fix issue in MIP in clique size computation and numerical issues
- Fix an issue in MIP where cut generation did not obey the time limit
- Fix an issue on QPs where maximization was not supported
- Fix rotated second-order cone detection: make canonical quadratic constraint Q matrix in triplet form
- Fix nonconvex quadratic constraint detection bug
- Fix a bug on QCQP models that incorrectly threw an unsupported exception
- Fix second-order cone index collision and incorrect quadratic constraint to cone conversion for rotated cone constraints
- Validate MPS row type byte before enum cast to avoid undefined behavior
- Fix destruction order and by-reference capture bugs in solve.cu
- Fix route priority sort indexing in routing
- Fix vehicle fixed cost accounting in fragment-vs-route deltas in routing
- Fix routing min-vehicles bug
- Fix libomp ABI incompatibility
- gRPC: fix race condition in gRPC with log streaming

@coderabbitai coderabbitai Bot Jul 31, 2026

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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Clarify the gRPC log-streaming entry.

Replace gRPC: fix race condition in gRPC with log streaming with gRPC: Fix a race condition in log streaming.

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@RELEASE-NOTES.md` at line 66, Update the gRPC log-streaming release-note
entry to read “gRPC: Fix a race condition in log streaming.”

- gRPC: cancel active jobs on delete
- gRPC: terminate workers cleanly on server shutdown
- gRPC: drain all remaining log lines at job completion in `StreamLogs`
- Fix row-major layout not preserved when resizing routing capacity routes
- Fix routing YAML best-results export
- Fix double `va_start` undefined behavior in C API error handling

### Documentation (26.08)

- Align cuOpt documentation branding and update Doxygen configuration
- Update cuOpt MIP positioning documentation

### New Contributors (26.08)

- @jolorunyomi
- @cafzal
- @Sylendran95
- @jackthepunished
- @fallintoplace
- @arhag23
- @divyegala

## Release Notes 26.06

### New Features (26.06)
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