GPQA Diamond — Epoch AI harness Effort: Low Configuration: Epoch AI harness 57.6% epoch.ai for GPT-5 nano (low) on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness (opens in a new tab) Archived copy (opens in a new tab) GPQA Diamond Accuracy Reported October 7, 2026 Evaluated July 13, 2026 at 5:28 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5 nano on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Epoch AI harness Effort: Medium Configuration: Epoch AI harness 67.4% epoch.ai for GPT-5 nano (medium) on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness (opens in a new tab) Archived copy (opens in a new tab) GPQA Diamond Accuracy Reported October 7, 2026 Evaluated August 7, 2025 at 7:34 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5 nano on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Epoch AI harness Effort: High Configuration: Epoch AI harness 69.4% epoch.ai for GPT-5 nano (high) on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness (opens in a new tab) Archived copy (opens in a new tab) GPQA Diamond Accuracy Reported October 7, 2026 Evaluated October 30, 2025 at 4:20 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5 nano on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Vals AI harness Effort: High Configuration: Vals AI harness: mean of zero-shot and few-shot CoT 63.4% vals.ai for GPT-5 nano (high) on Graduate-Level Google-Proof Q&A Diamond — Vals AI harness (opens in a new tab) Archived copy (opens in a new tab) GPQA Diamond Accuracy Reported September 1, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5 nano on Graduate-Level Google-Proof Q&A Diamond — Vals AI harness MMLU-Pro Original — Vals AI harness Effort: High Configuration: Vals AI harness 76.1% vals.ai for GPT-5 nano (high) on MMLU-Pro Original — Vals AI harness (opens in a new tab) Archived copy (opens in a new tab) Accuracy Reported September 1, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5 nano on MMLU-Pro Original — Vals AI harness MMMU-Pro Vals AI harness Effort: High Configuration: Vals AI harness 70.9% vals.ai for GPT-5 nano (high) on MMMU-Pro Vals AI harness (opens in a new tab) Archived copy (opens in a new tab) MMMU-Pro accuracy Setting: Standard (4 options) Reported September 1, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5 nano on MMMU-Pro Vals AI harness SimpleQA Verified Original — Epoch AI harness Effort: High Configuration: Epoch AI harness 11.7% epoch.ai for GPT-5 nano (high) on SimpleQA Verified Original — Epoch AI harness (opens in a new tab) Archived copy (opens in a new tab) Accuracy Reported October 7, 2026 Evaluated August 10, 2026 at 9:35 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5 nano on SimpleQA Verified Original — Epoch AI harness SWE-bench Verified — mini-swe-agent Effort: Medium Configuration: mini-swe-agent harness 34.8% github.com for GPT-5 nano (medium) on SWE-bench Verified — mini-swe-agent (opens in a new tab) Archived copy (opens in a new tab) Resolved Tasks Reported August 7, 2025 Benchmark repository SWE-bench Independent SWE-bench Team Record for GPT-5 nano on SWE-bench Verified — mini-swe-agent