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Timeline
Claude 3.5 Sonnet2026-04-18
Achieved 81.2% score on SWE-Bench coding benchmark
Claude 3.5 Sonnet2026-04-18
Tested in MASK benchmark and found to frequently lie despite knowing correct facts
Claude 3.5 Sonnet2026-03-29
Model appears to have been removed or changed from Claude Code platform
DeepSeek-R12026-03-27
Observed by Google researchers to spontaneously develop internal 'societies of thought' through reinforcement learning.
Claude 3.5 Sonnet2026-03-15
Demonstration of advanced financial analysis capabilities through prompt engineering
Claude 3.5 Sonnet2026-03-11
Release delayed by 10 days due to safety considerations
Claude 3.5 Sonnet2026-02-24
Version 4.6 update released with 'beastly' performance for agentic tasks and computer interaction.
DeepSeek-R12025-05-27
Achieved 79.8% on SWE-Bench Verified, matching Claude 3.5 Sonnet's performance
DeepSeek-R12025-01-01
DeepSeek-R1 model gained significant international attention in 2025 with strong performance on coding and reasoning benchmarks.
Ecosystem
DeepSeek-R1
developedDeepSeek5 src
deploysChain-of-Thought Prompting1 src
deploysSelf-Consistency1 src
deploysTest-Time Compute Scaling1 src
deploysReinforcement Learning from Human Feedback (RLHF)1 src
deploysProcess Reward Models1 src
Claude 3.5 Sonnet
developed byAnthropic8 src
usesAgentic AI1 src
usesagentic products1 src
usesMMLU1 src
competes withGPT-4o1 src
deploysChain-of-Thought Prompting1 src