APEX-Agents Original Effort: Max 58.2% mercor.com for GPT-5.6 Terra (max) on APEX-Agents Original (opens in a new tab) Archived copy (opens in a new tab) Pass rate Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on APEX-Agents Original AutomationBench 1.0.6 Effort: Low 7.5% zapier.com for GPT-5.6 Terra (low) on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 AutomationBench 1.0.6 Effort: Medium 8.1% zapier.com for GPT-5.6 Terra (medium) on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 AutomationBench 1.0.6 Effort: High 11.7% zapier.com for GPT-5.6 Terra (high) on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 AutomationBench 1.0.6 Effort: xHigh 14.8% zapier.com for GPT-5.6 Terra (xhigh) on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 AutomationBench 1.0.6 Effort: Max 23.6% zapier.com for GPT-5.6 Terra (max) on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 AutomationBench 1.0.6 0.8% zapier.com for GPT-5.6 Terra on AutomationBench 1.0.6 (opens in a new tab) Archived copy (opens in a new tab) Task pass rate Reported October 7, 2026 Benchmark leaderboard Zapier Independent Zapier AutomationBench Team Record for GPT-5.6 Terra on AutomationBench 1.0.6 BrowseComp 130-question subset — Mercor web research agent Effort: Max Configuration: Mercor web research agent, 100 steps, 3 hours 85.8% mercor.com for GPT-5.6 Terra (max) on BrowseComp 130-question subset — Mercor web research agent (opens in a new tab) Archived copy (opens in a new tab) BrowseComp Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on BrowseComp 130-question subset — Mercor web research agent BrowseComp 87.5% openai.com for GPT-5.6 Terra on BrowseComp BrowseComp (opens in a new tab) BrowseComp Accuracy Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on BrowseComp BrowseComp Chartography October 2026 leaderboard Effort: Max 34.0% surgehq.ai for GPT-5.6 Terra (Max) on Chartography October 2026 leaderboard (opens in a new tab) Archived copy (opens in a new tab) Chartography Pass@1 Reported October 7, 2026 Benchmark leaderboard Surge AI Independent Record for GPT-5.6 Terra on Chartography October 2026 leaderboard CharXiv Descriptive and reasoning — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 94.1% mercor.com for GPT-5.6 Terra (max) on CharXiv Descriptive and reasoning — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) CharXiv Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on CharXiv Descriptive and reasoning — Mercor single-shot CursorBench 4.0 Effort: Low 25.2% cursor.com for GPT-5.6 Terra (low) on CursorBench 4.0 (opens in a new tab) Archived copy (opens in a new tab) CursorBench Accuracy Reported October 7, 2026 Benchmark leaderboard Cursor Independent Record for GPT-5.6 Terra on CursorBench 4.0 CursorBench 4.0 Effort: Medium 27.6% cursor.com for GPT-5.6 Terra (medium) on CursorBench 4.0 (opens in a new tab) Archived copy (opens in a new tab) CursorBench Accuracy Reported October 7, 2026 Benchmark leaderboard Cursor Independent Record for GPT-5.6 Terra on CursorBench 4.0 CursorBench 4.0 Effort: High 30.7% cursor.com for GPT-5.6 Terra (high) on CursorBench 4.0 (opens in a new tab) Archived copy (opens in a new tab) CursorBench Accuracy Reported October 7, 2026 Benchmark leaderboard Cursor Independent Record for GPT-5.6 Terra on CursorBench 4.0 CursorBench 4.0 Effort: xHigh 33.6% cursor.com for GPT-5.6 Terra (xhigh) on CursorBench 4.0 (opens in a new tab) Archived copy (opens in a new tab) CursorBench Accuracy Reported October 7, 2026 Benchmark leaderboard Cursor Independent Record for GPT-5.6 Terra on CursorBench 4.0 CursorBench 4.0 Effort: Max 41.3% cursor.com for GPT-5.6 Terra (max) on CursorBench 4.0 (opens in a new tab) Archived copy (opens in a new tab) CursorBench Accuracy Reported October 7, 2026 Benchmark leaderboard Cursor Independent Record for GPT-5.6 Terra on CursorBench 4.0 DeepSWE 1.1 69.6% openai.com for GPT-5.6 Terra on DeepSWE 1.1 (opens in a new tab) DeepSWE Pass@1 Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on DeepSWE 1.1 DeepSWE 1.1 — Mercor mini-swe-agent, 500 steps Effort: Max Configuration: Mercor mini-swe-agent, 500 steps, 2 hours 70.2% mercor.com for GPT-5.6 Terra (max) on DeepSWE 1.1 — Mercor mini-swe-agent, 500 steps (opens in a new tab) Archived copy (opens in a new tab) DeepSWE Pass@1 Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on DeepSWE 1.1 — Mercor mini-swe-agent, 500 steps Finance Agent Benchmark 2 — October 2026 evaluation Effort: Max 54.4% vals.ai for GPT-5.6 Terra (max) on Finance Agent Benchmark 2 — October 2026 evaluation (opens in a new tab) Archived copy (opens in a new tab) Finance Agent Accuracy Reported October 6, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Finance Agent Benchmark 2 — October 2026 evaluation GDP.pdf 24.7% openai.com for GPT-5.6 Terra on GDP.pdf GDP.pdf (opens in a new tab) GDP.pdf All Pass Rate Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on GDP.pdf GDP.pdf GPQA Diamond 92.9% openai.com for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond (opens in a new tab) GPQA Diamond Accuracy Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond GPQA Diamond — Epoch AI harness Effort: None Configuration: Epoch AI harness 77.3% epoch.ai for GPT-5.6 Terra (none) 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, 2026 at 12:50 AM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Epoch AI harness Effort: Low Configuration: Epoch AI harness 87.4% epoch.ai for GPT-5.6 Terra (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 August 7, 2026 at 12:35 AM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Epoch AI harness Effort: Max Configuration: Epoch AI harness 93.3% epoch.ai for GPT-5.6 Terra (max) 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 9, 2026 at 5:07 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond — Epoch AI harness GPQA Diamond — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 93.2% mercor.com for GPT-5.6 Terra (max) on Graduate-Level Google-Proof Q&A Diamond — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) GPQA Diamond Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond — Mercor single-shot GPQA Diamond — Vals AI harness Effort: xHigh Configuration: Vals AI harness: mean of zero-shot and few-shot CoT 90.9% vals.ai for GPT-5.6 Terra (xhigh) 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-5.6 Terra on Graduate-Level Google-Proof Q&A Diamond — Vals AI harness HLAB October 2026 evaluation Effort: Max 0.8% vals.ai for GPT-5.6 Terra (max) on Harvey's Legal Agent Benchmark October 2026 evaluation (opens in a new tab) Archived copy (opens in a new tab) HLAB Task Pass Rate Reported October 6, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Harvey's Legal Agent Benchmark October 2026 evaluation Humanity's Last Exam Text only — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 44.9% mercor.com for GPT-5.6 Terra (max) on Humanity's Last Exam Text only — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) Humanity's Last Exam Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on Humanity's Last Exam Text only — Mercor single-shot MedXpertQA MM — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 75.7% mercor.com for GPT-5.6 Terra (max) on MedXpertQA MM — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on MedXpertQA MM — Mercor single-shot MMLU-Pro Original — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 88.1% mercor.com for GPT-5.6 Terra (max) on MMLU-Pro Original — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on MMLU-Pro Original — Mercor single-shot MMLU-Pro Original — Vals AI harness Effort: xHigh Configuration: Vals AI harness 86.7% vals.ai for GPT-5.6 Terra (xhigh) 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-5.6 Terra on MMLU-Pro Original — Vals AI harness MMMU-Pro 1,730 questions — Mercor single-shot Effort: Max Configuration: Mercor single-shot agent 80.9% mercor.com for GPT-5.6 Terra (max) on MMMU-Pro 1,730 questions — Mercor single-shot (opens in a new tab) Archived copy (opens in a new tab) MMMU-Pro accuracy Setting: Not stated Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on MMMU-Pro 1,730 questions — Mercor single-shot MMMU-Pro No tools Configuration: No tools 80.7% openai.com for GPT-5.6 Terra on MMMU-Pro No tools (opens in a new tab) MMMU-Pro accuracy Setting: Not stated Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on MMMU-Pro No tools MMMU-Pro Vals AI harness Effort: Max Configuration: Vals AI harness 86.5% vals.ai for GPT-5.6 Terra (max) 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-5.6 Terra on MMMU-Pro Vals AI harness MMMU-Pro With tools Configuration: With tools 82.0% openai.com for GPT-5.6 Terra on MMMU-Pro With tools (opens in a new tab) MMMU-Pro accuracy Setting: Not stated Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on MMMU-Pro With tools Riemann-bench October 2026 leaderboard Effort: Max 66.4% surgehq.ai for GPT-5.6 Terra (Max) on Riemann-bench October 2026 leaderboard (opens in a new tab) Archived copy (opens in a new tab) Riemann-bench Pass@1 Reported October 7, 2026 Benchmark leaderboard Surge AI Independent Record for GPT-5.6 Terra on Riemann-bench October 2026 leaderboard SimpleQA Verified Original — Epoch AI harness Effort: Max Configuration: Epoch AI harness 43.2% epoch.ai for GPT-5.6 Terra (max) 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 11:44 PM UTC Benchmark leaderboard Epoch AI Independent Record for GPT-5.6 Terra on SimpleQA Verified Original — Epoch AI harness SWE Atlas Codebase QnA — Mercor mini-swe-agent, 250 steps Effort: Max Configuration: Mercor mini-swe-agent, 250 steps, 1 hour 45.2% mercor.com for GPT-5.6 Terra (max) on SWE Atlas Codebase QnA — Mercor mini-swe-agent, 250 steps (opens in a new tab) Archived copy (opens in a new tab) Mean pass@1 Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on SWE Atlas Codebase QnA — Mercor mini-swe-agent, 250 steps SWE-bench Multilingual — Mercor mini-swe-agent, 1000 steps Effort: Max Configuration: Mercor mini-swe-agent, 1000 steps, 3 hours 94.4% mercor.com for GPT-5.6 Terra (max) on SWE-bench Multilingual — Mercor mini-swe-agent, 1000 steps (opens in a new tab) Archived copy (opens in a new tab) Resolved Tasks Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on SWE-bench Multilingual — Mercor mini-swe-agent, 1000 steps SWE-bench Verified — Mercor mini-swe-agent, 1000 steps Effort: Max Configuration: Mercor mini-swe-agent, 1000 steps, 3 hours 77.8% mercor.com for GPT-5.6 Terra (max) on SWE-bench Verified — Mercor mini-swe-agent, 1000 steps (opens in a new tab) Archived copy (opens in a new tab) Resolved Tasks Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on SWE-bench Verified — Mercor mini-swe-agent, 1000 steps SWE-bench Verified — Vals AI mini-swe-agent Effort: Max Configuration: mini-swe-agent harness 95.4% vals.ai for GPT-5.6 Terra (max) on SWE-bench Verified — Vals AI mini-swe-agent (opens in a new tab) Archived copy (opens in a new tab) Resolved Tasks Reported September 1, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on SWE-bench Verified — Vals AI mini-swe-agent Terminal-Bench 2.1 87.4% openai.com for GPT-5.6 Terra on Terminal-Bench 2.1 (opens in a new tab) Terminal-Bench Accuracy Reported July 9, 2026 Launch post OpenAI Self-reported Record for GPT-5.6 Terra on Terminal-Bench 2.1 Terminal-Bench 2.1 — Vals AI Terminus 2 Effort: Max Configuration: Terminus-2 harness 77.5% vals.ai for GPT-5.6 Terra (max) on Terminal-Bench 2.1 — Vals AI Terminus 2 (opens in a new tab) Archived copy (opens in a new tab) Terminal-Bench Accuracy Reported September 28, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Terminal-Bench 2.1 — Vals AI Terminus 2 Terminal-Bench 4.0 — Codex Effort: Max Configuration: Codex harness 21.5% tbench.ai for GPT-5.6 Terra (max) on Terminal-Bench 4.0 — Codex (opens in a new tab) Archived copy (opens in a new tab) Terminal-Bench Accuracy Reported June 26, 2026 Benchmark leaderboard Terminal-Bench Independent Terminal-Bench Team Record for GPT-5.6 Terra on Terminal-Bench 4.0 — Codex Terminal-Bench 4.0 — Mercor mini-swe-agent Effort: Max Configuration: Mercor mini-swe-agent, 1000 steps, 8 hours 24.7% mercor.com for GPT-5.6 Terra (max) on Terminal-Bench 4.0 — Mercor mini-swe-agent (opens in a new tab) Archived copy (opens in a new tab) Terminal-Bench Accuracy Reported October 7, 2026 Benchmark leaderboard Mercor Independent Record for GPT-5.6 Terra on Terminal-Bench 4.0 — Mercor mini-swe-agent Terminal-Bench 4.0 — Vals AI mini-swe-agent Effort: Max Configuration: mini-swe-agent harness 22.7% vals.ai for GPT-5.6 Terra (max) on Terminal-Bench 4.0 — Vals AI mini-swe-agent (opens in a new tab) Archived copy (opens in a new tab) Terminal-Bench Accuracy Reported October 6, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Terminal-Bench 4.0 — Vals AI mini-swe-agent Vals Index 2.1 Effort: Max 53.1% vals.ai for GPT-5.6 Terra (max) on Vals Index 2.1 (opens in a new tab) Archived copy (opens in a new tab) Vals Index GDP-weighted Accuracy Reported October 6, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Vals Index 2.1 Vibe Code Bench 1.1 — OpenHands, October 2026 evaluation Effort: Max Configuration: OpenHands harness 74.6% vals.ai for GPT-5.6 Terra (max) on Vibe Code Bench 1.1 — OpenHands, October 2026 evaluation (opens in a new tab) Archived copy (opens in a new tab) Vibe Code Bench Score Reported October 6, 2026 Benchmark leaderboard Vals AI Independent Record for GPT-5.6 Terra on Vibe Code Bench 1.1 — OpenHands, October 2026 evaluation