Cost Impact
At Claude Sonnet 4 pricing ($3 per million input tokens), 33k tokens cost $0.099 per request. OpenCode at 7k costs $0.021. That is a 4.7x difference on the overhead alone.
If you make 100 requests per day, Claude Code costs $9.90 in overhead vs OpenCode's $2.10. Over a month, that is $297 vs $63. For a team of 10 developers, the gap widens to $2,970 vs $630.
Latency Impact
Token generation is not instant. Each token takes roughly 2-3ms on average. 26k extra tokens means 52-78ms of additional latency before the model even sees your prompt. That does not sound like much, but in interactive use, it adds up. After 10 requests, you have waited half a second extra. After 100 requests, 5 seconds.
More importantly, the model's attention span degrades with longer contexts. A 33k overhead means the model has processed more tokens before your instruction, which can dilute its focus on what you actually asked.
Why Does Claude Code Send So Many Tokens?
Claude Code is built by Anthropic and prioritizes safety and reliability. The large system prompt includes guardrails against prompt injection, constraints on file modifications, and detailed tool schemas. It also runs a full git diff to understand the project state, which is useful for generating accurate diffs but expensive.
OpenCode, an open-source alternative, takes a minimal approach. It assumes the user knows what they are doing and does not add heavy safety layers. This makes it faster and cheaper but potentially less safe for automated workflows.
When to Use Each
Claude Code is better for:
- Complex refactoring where safety matters (e.g., modifying production code)
- Teams that need detailed audit trails
- Projects with strict compliance requirements
OpenCode is better for:
- Rapid prototyping and exploration
- Cost-sensitive environments (startups, personal projects)
- Users who want full control over context
Practical Tips to Reduce Overhead
If you use Claude Code, you can reduce overhead by:
- Using the
--no-git-diff flag to skip git diff
- Manually specifying files with
-f instead of letting it auto-load
- Setting
CLAUDE_CODE_MAX_CONTEXT to limit context size
With OpenCode, overhead is already low, but you can further reduce it by:
- Avoiding unnecessary file references
- Using short, focused prompts
- Disabling git integration if not needed
The Bottom Line
26k tokens of overhead is not negligible. It costs money and time. But it is not always bad. Claude Code's extra context can lead to better results in complex scenarios. OpenCode's minimalism is great for speed and cost.
Choose based on your tolerance for latency and your budget. If you are building agentic workflows at scale, every token counts. Measure your own usage and decide.
Keep Reading
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