OpenCode Go and OpenCode Zen both provide model access, but they use different billing models.
- OpenCode Go is a monthly subscription for a changing pool of selected open coding models. It applies usage-value limits across a five-hour window, a week, and a month.
- OpenCode Zen is a pay-as-you-go AI gateway. You add balance and pay the current per-model token rates for what you use.
Go is easier to evaluate when your usage is regular and its current model pool covers your work. Zen maps more directly to variable token usage and offers a different model catalog. Neither is automatically cheaper: the result depends on the model, input and output tokens, task success rate, and whether Go's limits cause a fallback to Zen balance.
Prices, limits, promotions, and model lists change. Every numerical fact below was checked against official OpenCode pages on August 27, 2026 and should be verified again before purchase.
OpenCode Go vs Zen at a glance
This comparison is about the model-supply layer. OpenCode itself is the agent harness. If that distinction is unclear, first separate the agent harness from the model.
What is OpenCode Go?
The official Go documentation describes Go as an optional low-cost subscription for popular open coding models. You subscribe through the OpenCode account flow, receive an API key, connect the OpenCode Go provider, and use /models to see the pool available at that time.
The current documentation and Go landing page both showed a standard price of $10 per month when checked on August 27, 2026. Recheck the current checkout price before purchasing because plan terms can change.
Go's current limits are expressed as usage value:
These values do not promise a fixed number of prompts. A lower-priced model can support more requests within the same allowance; a more expensive model can use it faster. Prompt length, output length, caching, and the number of agent turns also change the result.
OpenCode publishes estimated request counts for its current models, but those figures depend on typical usage assumptions and can change with the model pool or pricing. Use them as directional examples, not a quota guaranteed for every prompt.
The docs also say only one member per workspace can currently subscribe to Go. Teams should recheck that condition rather than assuming one subscription covers every member.
What is OpenCode Zen?
The official Zen documentation describes Zen as an optional AI gateway containing models that OpenCode says it has tested and selected for coding agents. You add balance, connect the Zen provider, and pay according to the selected model's current usage price.
Zen's rate card is model-specific and generally lists input, output, and cache prices per one million tokens. Some endpoints may be temporarily free, while other models have materially different input and output rates. The catalog and prices can change independently.
Pay as you go has a simple advantage for analysis: the bill can be mapped to the actual tokens and model route used. It does not guarantee a lower total cost. Agent loops that produce long outputs, retry failed tool calls, or repeat large contexts can consume more balance than a single-turn estimate suggests.
OpenCode's claims that Zen models are tested or optimized are vendor statements. They can justify putting a model on a test list, but they do not replace evaluation in your repository, with your tools and acceptance checks.
What happens when you reach an OpenCode Go limit?
According to the current Go documentation, reaching a Go usage limit does not convert the subscription into unlimited paid usage.
- Free models can remain available.
- If the account also has Zen credit, the user can enable Use balance.
- With that option enabled, requests can fall back to Zen balance after the relevant Go limit is reached rather than simply stopping.
This behavior makes cost planning more important. A Go subscription plus automatic Zen fallback is effectively a two-part budget: the fixed subscription and any variable Zen spend after limits.
If predictable spend is the goal, decide whether fallback should be enabled and set an appropriate balance or spend control. Do not discover the overage path only after a long agent session has consumed it.
The Go page explicitly says usage limits may change as OpenCode learns from early usage and feedback. Recheck all three windows rather than looking only at the monthly headline.
Which usage pattern fits Go or Zen?
There is no honest answer without a workload. These scenarios show how to frame the decision.
Regular use of models already in the Go pool
Go may be easier to budget when the same developer regularly uses models included in the current pool and the workload fits the five-hour, weekly, and monthly limits.
Check the shortest window first. A user can fit under the monthly value but still hit the five-hour limit during an intensive coding session. Also confirm that the model you want is still included; the official list is dynamic.
Variable or occasional model use
Zen may map more cleanly to sporadic usage because there is no need to justify a monthly subscription solely from prompt count. Estimate the actual input, output, and cache tokens for representative tasks, then add failed runs and retries.
The risk is variability: one long repository task can cost much more than a short chat. Balance alerts and spend controls matter more than a simple per-request expectation.
Need for a model outside the current Go pool
Zen may be the relevant OpenCode-provided route if the required model appears there but not in Go. Other direct providers or gateways may also be available in OpenCode. Go and Zen are optional; they are not the only ways to use the harness.
Use the OpenCode providers and model IDs guide to verify the exact current routes rather than assuming a plan name determines compatibility.
Team or shared-workspace use
The current Go documentation says one member per workspace can subscribe. That makes an individual subscription different from an organization-wide seat or shared allowance. Confirm account ownership, credential sharing restrictions, billing responsibility, and the current workspace rule before planning a team rollout.
Neither plan name proves that project files, sessions, terminals, or previews persist in a cloud development environment. Provider billing and workspace hosting are separate product layers.
How to compare Go and Zen with your own usage
Use real tasks from the last week rather than an imagined average.
Step 1: Choose representative tasks
Pick at least three task types, for example:
- a short code explanation with no edits;
- a multi-file fix with tests;
- a longer agent run that searches, edits, validates, and recovers from one failure.
Step 2: Record complete usage
For each task, capture:
- model and full provider/model route;
- input, output, and cached tokens if available;
- number of turns and tool calls;
- failed or repeated runs;
- elapsed time and whether the acceptance check passed.
Step 3: Estimate Zen spend
For each model, apply the current official input, output, and cache rates to the complete task usage. Add all retries, not just the successful final call.
Step 4: Map the same work to Go limits
Use the current official Go usage-value assumptions for that model. Check whether the tasks fit the five-hour window, the weekly total, and the monthly total. Do not convert the headline $60 monthly usage value into a universal prompt count.
Step 5: Include fallback behavior
If Use balance will be enabled, estimate likely Zen spend after the first Go limit is reached. If it will be disabled, account for the operational cost of waiting or switching models.
Step 6: Compare accepted-task cost
The useful denominator is not messages sent. It is tasks that pass the same validation standard. A lower-cost route that needs repeated correction may cost more per accepted task.
Why token price and request limits are not interchangeable
Go publishes usage limits and illustrative request counts. Zen publishes per-token prices. Converting one into the other requires assumptions about prompt size, output size, caching, model choice, and agent behavior.
For example, two requests to the same model can consume very different amounts if one sends a small diff and the other sends a large repository context. A coding agent can also make several model turns and tool calls before one user-visible answer.
Avoid a false break-even number built from one “average prompt.” Use a range based on real light, normal, and heavy tasks. State the date of the rate card and update the calculation when models or limits change.
Go, Zen, OpenCode, and Agent.Space solve different layers
The products can appear in the same workflow without being interchangeable.
Agent.Space operates at the Agent and workspace layer, with its own current model and plan availability. This article does not claim that Agent.Space supports every Go or Zen model, API key, or billing path.
If persistence and collaboration are the real requirement, compare local and cloud OpenCode workflows separately from the provider price calculation.
Decision checklist
Before choosing either option, answer these questions using the current official pages:
- Is the required model available in Go, Zen, another provider, or more than one route?
- What are today's standard price, promotion, token rates, and all three Go limits?
- Does your workload fit the five-hour window as well as the monthly allowance?
- Will Zen balance fallback be enabled after a Go limit?
- What did recent accepted tasks consume, including retries?
- Does the current one-member-per-workspace Go condition affect the intended account setup?
- Are provider data handling, region, payment, and credential rules acceptable?
- Is the actual problem model access, or is it persistent workspace and collaboration?
Go offers a subscription framework around a selected model pool. Zen offers variable spend tied to a wider pay-as-you-go catalog. Choose with a dated workload calculation, not a universal winner label.
FAQ
Is OpenCode Go the same as Zen?
No. Go is a monthly subscription with usage-value limits and a selected model pool. Zen is a pay-as-you-go gateway where usage consumes balance according to the selected model's current price.
How much does OpenCode Go cost?
The official documentation and Go landing page both showed $10 per month when checked on August 27, 2026. Recheck the current checkout and documentation before purchasing because plan terms can change.
What are the OpenCode Go limits?
The official docs checked on August 27 listed $12 of usage per five-hour window, $30 per week, and $60 per month. These are usage-value limits, not fixed request counts, and OpenCode says they may change.
Can Go use Zen balance after a limit?
The current docs say users with Zen credit can enable Use balance so requests fall back to that balance after Go limits. Verify the current account control and set a deliberate spend boundary.
Can I use OpenCode without Go or Zen?
Yes. Both services are optional provider choices. OpenCode supports many other providers and local models, subject to their current authentication and compatibility requirements.
Which is cheaper, OpenCode Go or Zen?
There is no universal answer. Compare recent accepted-task usage against all Go limit windows and the current Zen rate card, including retries and any Go-to-Zen fallback spend.