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To: [email protected]
Date: Thu, 19 Mar 2026 22:00:11 GMT
Subject: Composer 2 hits the high notes
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Jellyfish AI study shows the sting has yet to land
March 19, 2026
Composer 2 hits the high notes
On Thursday, Cursor (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3nKW5RBsn07J2VqZN3790Tkd2-FpN5J4rLyT_ld_N8ZvFty8wRqbW4yLm8l3yL6XlW2J74bf7vYMnJW7VP8fw7yL_4MVy82h16z7FfsVYdYkq3zV_5BW5phcqK2ly1fqW1v3bbR6QPj3VW1Ys4DB9cyc1GW1NS-417C3swmW6fsFVs44tZ33W6QXRr43zW_wPVRrVlB4dTn_RW3WL18z5sxDzdW4S4C3B6l1g5yW6xwM1h2Wg9vWW70CJ_d5QxKW7W4XjHZ53fTdb2W74gPnG14l5cNVRXWMg24qQ34VbT2tF4hlq2kVVrX_J4YJBNjVyv3rg8cH-cDf7-xmml04 ) , the AI-assisted code editor, took another shot at its much-larger competitors when it released Composer 2, an AI model that outperforms Anthropic’s Opus 4.6 on some key coding benchmarks, and does so at a fraction of the cost.
Composer 2 is the third generation of its in-house coding model in five months, writes Frederic Lardinois, Senior Editor for AI, showing that Anysphere, the company that makes Cursor, is playing at an allegro speed.
Previous models applied reinforcement learning to an existing base model without modifying the base itself, Lardinois writes. But Composer 2 is the first version where Cursor ran continuous pre-training, which the company says provided “a far stronger base to scale our reinforcement learning.”
Go deeper: Cursor’s Composer 2 beats Opus 4.6 on coding benchmarks at a fraction of the price (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3nKW5RBsn07J2VqZN3790Tkd2-FpN5J4rLyT_ld_N8ZvFty8wRqbW4yLm8l3yL6XlW2J74bf7vYMnJW7VP8fw7yL_4MVy82h16z7FfsVYdYkq3zV_5BW5phcqK2ly1fqW1v3bbR6QPj3VW1Ys4DB9cyc1GW1NS-417C3swmW6fsFVs44tZ33W6QXRr43zW_wPVRrVlB4dTn_RW3WL18z5sxDzdW4S4C3B6l1g5yW6xwM1h2Wg9vWW70CJ_d5QxKW7W4XjHZ53fTdb2W74gPnG14l5cNVRXWMg24qQ34VbT2tF4hlq2kVVrX_J4YJBNjVyv3rg8cH-cDf7-xmml04 )
More essential reads for your Thursday:
◆ Jellyfish AI development study: The real sting has yet to land (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3n1W6MJjT81Z9ySGN35K5cZbDjW9W5DfxPb1JmF2XVMwNPv4rKKQjW7rRg-L6LgvWTW1sxqyF3jwkHDW1CFn7R4TgH6dW6hFl866DqzPvVxWBG71n7tRGW4lrYTS3tSkvrVfq4mD2LLBvwW2rv7vd665C_PW8jP4fm37KmQKW2Z0mGJ5nKsM_N22MTMhVZTtPVd0zYd84NcWWW6G1hh11R1WDsN2CY-s5ssV4xW7_4nJw1Yr2NlW6wVZ944kBvP_W6T0-Pq1QtC2tW7K9Pvc3D3tWPW8czzpZ52MrHDW4d7_Ns6qtn7HW29YjX07MmH5fW6V6hDS4csld1f6RDMFx04 )
◆ Sampling: the philosopher’s stone of distributed tracing (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg8983prCCW8wLKSR6lZ3lfW7P_k601SSNZKW76YnfV8NC13RN7TK847KNwy1Mdl-NpNNG03W5CHkhp2Q2cr8W947SHS4Lk-ZHW9dQ6NW6HlkSzW2XCckL1LhYH-W2Zk0Bg6tWX4mW8hCBvw54kdqLW6BXb6y34DLvfW1Nzr6C2H3rF-W2j8PCs8vRw_rW7D1KWh7hTDdhN7s83RTG7f19N6BlgDSRnXCbW7sPTrL8p4glKW1swQDm4VzjcGW1-pyV59gJMrXW5czYVq8fBLQzW6k17vD9bJSPKW7BJ3P_1PjrfcW1WG4J78yxCd1MMggnZcR_VwN5MtLp-dGbqjW83yhQG8TtyKVW3nCRT215W6TtW8XDTL73bHtYXf5Pw_QY04 )
◆ Building a Kubernetes-native pattern for AI infrastructure at scale (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3ndW5RtdZv2KWh0YW3Jf0rX8f6mF3W3gPlPV70Jl78W1143_v56Y4wbW1B603W5kbrcWW4VxCyr1MhvpPW8ynTFd6lhFfmW2kGjFj5hXc08W1G9j9x3xbV08VWRkgr7ldDTCN35JQhTSd277W9hf3wB97x323W8my6Rr2X2PtQVyHkRl4J0HB_N37Qyzt9KD_6W83Nx1N3mmCTBW68X7JR3svJ9tVyvtRG2V-jbJW6z-HJw9chdgxW49P3JR6dwt8wW4nC6Wv8M8qbCW2D5m-Z4wX_7fVPRZcy44DMNHW7s4nWx2Nvxy-W52K2Lb3Sx4RVW3g5mBb345Ts6f8ymkTj04 )
TOP OF THE STACK
Cursor's Composer 2 beats Opus 4.6 on coding benchmarks at a fraction of the price
Featued image for: Cursor’s Composer 2 beats Opus 4.6 on coding benchmarks at a fraction of the price (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3pFW3QRnyB8F4Dg_W7HGDfM4j3GPBW8_syY06dmlb0N71p_SHwqL4QW497cz-3sPL3CW5v7MLZ76rBllW82nYH27j1zhvW52nwKp6Kl_4XVMnx7-3GM8cXW6XFTxM1tDS8vW8K3cHx4gyx9BN6Wbp_0rztTsW4Z6nSZ62gl7pW6m0x8G2_bSlyVpXK1M7K6FjYW3QSYgn4QZwgqW5WTrvw2F1JmKW75fplB62gwnmW8BPt2n3GFrqSW5LV7ww8sz2h1Vl6Ym_67Gy0bN17LJ8xZ-q-vW68Ff-x1txmCxW5jnLZd8LMhm_W6cKVfK2q1B2wVKDmXv4JqKYKf3c6X2j04 )
A new training technique that teaches the model to summarize its own context is the key to Composer 2's performance leap.
Cursor on Thursday released Composer 2, the third generation of its in-house coding model. The model outperforms Anthropic’s Opus 4.6 on some key coding benchmarks, and does so at a fraction of the cost.
The new Cursor model costs as little as $0.5 per million input tokens and $2.5 per million output tokens. There is...
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Featued image for: Chainguard has a fix for the open source packages your AI agents keep grabbing (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3q0N5g88G68vXVGW8XBLsJ3JkBw-W4Ff4xJ4S6XzqN4dRC9t6jhVJVq-r242R7sLnW4QS5B23dxwYzVhW0NC5kdk_1W3HM0DC4YDhTCW338CQt6tdDcHW1G07qm3l6_mGW4qbv4p8VsRPCN3KhPlwJ8lHhW49pLtd2DftxZW5Krdn-6MNWzxW8Tv_Hb1CN60-W3NcWK13-j4HsN6WdBCKfVmzXVmkYTt6wSd5GW6KnpGg4kg2jSW4Nkdvz7X8KlRW24CL184rQhGqW1JNwHH5fngwGVdlgsg21s16YW3m_sZX9gZ-ZjW3RzGzl5bSY2NW2qDdVm2zhtD2f3vWw_604 )
Chainguard has a fix for the open source packages your AI agents keep grabbing (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3q0N5g88G68vXVGW8XBLsJ3JkBw-W4Ff4xJ4S6XzqN4dRC9t6jhVJVq-r242R7sLnW4QS5B23dxwYzVhW0NC5kdk_1W3HM0DC4YDhTCW338CQt6tdDcHW1G07qm3l6_mGW4qbv4p8VsRPCN3KhPlwJ8lHhW49pLtd2DftxZW5Krdn-6MNWzxW8Tv_Hb1CN60-W3NcWK13-j4HsN6WdBCKfVmzXVmkYTt6wSd5GW6KnpGg4kg2jSW4Nkdvz7X8KlRW24CL184rQhGqW1JNwHH5fngwGVdlgsg21s16YW3m_sZX9gZ-ZjW3RzGzl5bSY2NW2qDdVm2zhtD2f3vWw_604 )
Featued image for: Sauce Labs wants to solve an AI-created problem nobody wanted to work on (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3m7W5Q9NcL4jd3zMW3F-_4h10Nv4SW1KXbDL1xnk_jN7-SZrldgGZ4W4TzfPg4l3mmsW2wQTQF1Pnj93VBkrl426dn09W73JngH6rM0TLW8fqT8F66zxSSN7tm_BFT40NZW9cDfsb4cVWVLMNtm3FVf_DNW6SmSgZ8tfqvgW1mj-xt4sDNhgW8q2_5D3ZDyHjW7vnCXl5N8h7BW30Bw5N6jlYksW3022QZ3s0zSTN8x-7_bGmVvnW2m2bCK2G5C6tW17bHBm56kN1NN5mWTG5W4TfpW94_vvs1-blfyW3Rm0XG88KHSdVDNqMf1cCGx6W4sFkP87PDdQyf1RMlKn04 )
Sauce Labs wants to solve an AI-created problem nobody wanted to work on (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3m7W5Q9NcL4jd3zMW3F-_4h10Nv4SW1KXbDL1xnk_jN7-SZrldgGZ4W4TzfPg4l3mmsW2wQTQF1Pnj93VBkrl426dn09W73JngH6rM0TLW8fqT8F66zxSSN7tm_BFT40NZW9cDfsb4cVWVLMNtm3FVf_DNW6SmSgZ8tfqvgW1mj-xt4sDNhgW8q2_5D3ZDyHjW7vnCXl5N8h7BW30Bw5N6jlYksW3022QZ3s0zSTN8x-7_bGmVvnW2m2bCK2G5C6tW17bHBm56kN1NN5mWTG5W4TfpW94_vvs1-blfyW3Rm0XG88KHSdVDNqMf1cCGx6W4sFkP87PDdQyf1RMlKn04 )
Featued image for: Capital One deprecated an AI tool it once championed. Its DevEx chief says that’s the point. (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3mPW4lqnJ13X5pqmW3VqBjh2MZJB7W4CK9nb5P_qRlN6lFd_cdb9b4W1DcK6-7XcjlsW4gLqDs4s3v6yW6t1xqV5BMkBWW4yzPcV1fnFsnW4fLxH18Vv1tWW73VFsz4jd_pqW2y0KJc4LH8mKW72xntP8YQxkQW2KdKn33pX-SfF3K9qNYdcl_W8fqzsz99qGh2N45LbMhzcF16W5JZLhc1_LZD5W7p1Kn943rNsKW5MSDhK19B0xYW8ZLNRj6mMLy6W7YTcQX8mXMFXW1gKc7d6V587bW1mtzrx8Wdq33W46YqRW54v_14N3tMCKW6xf6hW2L-m4S9k6FkVdCyST004 )
Capital One deprecated an AI tool it once championed. Its DevEx chief says that's the point. (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3mPW4lqnJ13X5pqmW3VqBjh2MZJB7W4CK9nb5P_qRlN6lFd_cdb9b4W1DcK6-7XcjlsW4gLqDs4s3v6yW6t1xqV5BMkBWW4yzPcV1fnFsnW4fLxH18Vv1tWW73VFsz4jd_pqW2y0KJc4LH8mKW72xntP8YQxkQW2KdKn33pX-SfF3K9qNYdcl_W8fqzsz99qGh2N45LbMhzcF16W5JZLhc1_LZD5W7p1Kn943rNsKW5MSDhK19B0xYW8ZLNRj6mMLy6W7YTcQX8mXMFXW1gKc7d6V587bW1mtzrx8Wdq33W46YqRW54v_14N3tMCKW6xf6hW2L-m4S9k6FkVdCyST004 )
Featued image for: Scaling Btrfs to petabytes in production: a 74% cost reduction story (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3mSW1cMgPG136kSFW7QD_9z7_zFWWLR_HWh5MQVW12KJ392LTp9sW8GVGyH8JTmp6W8KfK1c5lYsQvW1nW4_k4DlQd2W2-pjxR4vl8HbVSFcdf75SBPDW3DVSsX78klbQW292wZL9cmcs5W586Mmx1M6hBvW6Q8TwS3h0c45W7L54vK4PBFCTW6JlmT-5pSS4sW68yTfD2gwMQtW56zVmG89z4qNW6XHW4R70mxhsVNXFKX6WQnrJW1SpjgY4flbTqW2zCZRS84qyxjVWxJ-h1v1BccW51L2754V85RbVDfKzq6khFmTW8DCJ3153Y6KhW1RnpDG62_Thsf77HqD204 )
Scaling Btrfs to petabytes in production: a 74% cost reduction story (https://info.thenewstack.io/e3t/Ctc/L2+113/d5qLSh04/MVxsjR13LYDW2Z7J2K5_Ytq5VrHz2f5LS8ngN3Lg88T3prCCW7Y8-PT6lZ3mSW1cMgPG136kSFW7QD_9z7_zFWWLR_HWh5MQVW12KJ392LTp9sW8GVGyH8JTmp6W8KfK1c5lYsQvW1nW4_k4DlQd2W2-pjxR4vl8HbVSFcdf75SBPDW3DVSsX78klbQW292wZL9cmcs5W586Mmx1M6hBvW6Q8TwS3h0c45W7L54vK4PBFCTW6JlmT-5pSS4sW68yTfD2gwMQtW56zVmG89z4qNW6XHW4R70mxhsVNXFKX6WQnrJW1SpjgY4flbTqW2zCZRS84qyxjVWxJ-h1v1BccW51L2754V85RbVDfKzq6khFmTW8DCJ3153Y6KhW1RnpDG62_Thsf77HqD204 )
The 2 failures with AI coding that are creating security bottlenecks
AI coding tools are creating massive security bottlenecks. Learn about the main failures driving this crisis and how to avoid them.
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