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2025: The year I stopped writing code

Channel: Theo - t3․gg Published: 2026-01-02 14:33
Theo - t3․gg

Theo argues that 2025 was the year AI code tooling crossed from novelty to daily infrastructure: reasoning models improved, agents became practical, coding CLIs like Claude Code became central, and developers increasingly spent more time reviewing than typing code. He frames this as a durable shift in how software is built, while also warning about security, cost, and overreliance on unsafe automation.

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Detailed summary

Theo’s core thesis is that 2025 was the year programming changed in a lasting way because AI models, tool use, and harnesses all improved at once. He says the biggest shift was not simply smarter models, but the arrival of reasoning, agentic workflows, and coding CLIs that let models write, run, inspect, and iterate on code in a loop. In his view, this made it feel normal to spend less time inside an editor and more time reviewing, prompting, and steering code generation. He starts with the reasoning-model wave, pointing to DeepSeek R1 as the catalyst that made reasoning visible and widespread. He says OpenAI, Anthropic, and others followed with reasoning variants and control dials, and that reasoning became especially useful once combined with tools. …

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Main takeaways

  1. Reasoning models moved from novelty to the default expectation in 2025.
  2. Tool use is where reasoning mattered most; search and coding got much better.
  3. Claude Code became the emblematic coding-agent product of the year.
  4. Developers increasingly review code rather than type it by hand.
  5. Longer tasks, larger PRs, and higher output per developer suggest a real workflow shift.
  6. YOLO mode and unsafe automation are becoming normalized, which creates security risk.
  7. $200/month AI plans are changing both user behavior and AI-company economics.
  8. Chinese open-weight models became a major competitive force.

Market read by horizon

Short term

Tactically, the near-term trade is continued momentum in AI coding tools and agent workflows, with the market still rewarding products that make models more autonomous and easier to use. The main immediate risk is a high-profile safety failure or a slowdown in model improvement that dents the current enthusiasm.

  • Immediate focus is the current wave of coding-agent adoption, especially Claude Code, Codex, and browser/web agents.
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  • Watch whether AI coding tools keep improving on hard tasks and whether YOLO usage stays safe enough to avoid a major incident.
  • A near-term risk is over-automation causing destructive mistakes on local machines or in CI.
Mid term

Over the next few months, the base case is that coding agents keep taking share from manual workflows as teams trust them on longer and more complex tasks. If success rates and reviewability keep improving, the category should consolidate around the most useful harnesses rather than the flashiest demos.

  • Over the next several weeks to months, the base case is that coding agents continue taking share from manual editing workflows.
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  • Confirmation would come from better success on longer tasks, more complex repo changes, and rising trust in automated PRs.
  • If models plateau or tool reliability worsens, the current enthusiasm for agentic coding could stall.
Long term

Structurally, this points to a regime where software is increasingly produced by model-assisted automation and humans shift toward supervision, review, and systems design. The durable winners are likely to be the model platforms and workflow layers that control context, tools, and verification.

  • Structurally, the video argues that software development is shifting toward human-directed automation rather than human typing.
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  • The durable thesis is that the most valuable layer will be the harness around models: tools, context, workflows, and verification.
  • If this regime persists, the market implication is that model providers gain leverage while many thin AI wrappers become vulnerable.
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Key claims (12)

BULLISH AI model capability improvement

The improvements in AI coding models and tooling have shifted expectations so that tasks that were impossible 3 months ago are now routine.

The speaker describes how rapidly model capabilities have advanced, citing personal experience with early GPT-5 in cursor and noting that most labs now have models that can handle previously impossible tasks.

BULLISH AI reasoning

Reasoning models (like GPT-5 thinking) have solved the gullibility problem that previously prevented agents from working meaningfully.

Speaker notes that Simon's 'gullibility problem' (LMs believing anything you tell them) was the roadblock, and reasoning models address it.

BULLISH AI coding agents

Coding agents (CLI-based AI coding tools) are the most impactful category of AI agents in 2025, larger than deep research or AI search patterns.

Speaker contrasts coding agents with deep research/search patterns and asserts coding agents are the more impactful event of 2025.

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Assets discussed (9)

Blacksmith
BULLISH other

Promoted as a faster CI/build product with lower cost and better observability.

DeepSeek R1
BULLISH other

Used as the example that kicked off the reasoning-model wave.

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Interview (10 Q&A)

gullibility problem

How does Simon define the gullibility problem with LLMs?

Simon defines the gullibility problem as LLMs believing anything you tell them, so any system that attempts to make meaningful decisions on your behalf runs into the roadblock of not being able to distinguish truth from fiction. The speaker agrees reasoning would help with that.

Claude version naming

Why did Anthropic jump from Claude 3.5 to 3.7?

Anthropic had an update to 3.5 in October but kept the same name, which everyone unofficially called 3.6. So they effectively burned a version number due to their naming choices.

Claude Code strategy

What was Boris's insight about building Claude Code relative to model improvements?

Boris understood the scaling laws internally about how quickly models improve. He pushed the team not to build for the model of today but to build for the model six months from now. For a long time Claude Code wasn't a great product and was used for only about 10% of code, but when Sonnet and Opus 4 released in March, the product suddenly worked and usage soared, with most of Claude Code now being written by Claude Code itself at 80-90%.

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Where this transcript pushes against consensus

  • The claim that OpenAI had not changed its pre-training and was mainly layering reinforcement learning is presented as an allegation without internal confirmation.
  • The assertion that MCP is a one-year wonder is plausible but more opinionated than demonstrated.
  • He suggests Claude Code revenue is about $1B/year and mentions it casually; no source is provided in the transcript.
  • Some product comparisons are subjective, especially around Gemini, OpenAI, Cursor, Claude Code, and Codex.
  • He implies the risk of unsafe agent use is manageable for him because he lacks production keys locally; that may not generalize to most users or companies.

Topics

reasoning modelsAI coding agentsClaude Codevibe codingYOLO modeMCPopen-weight modelsChinese AI labsAI subscriptions economicsAI security

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