opencode: Model updates (#57076)

**TL;DR**: clearer docs + models cleanup.

----

**Docs**: 
- as per the discussion in
https://github.com/zed-industries/zed/issues/56869, added a note to the
docs highlighting that temporary models should be configured using
Custom Models. Adding a whole example felt redundant considering the
full example is literally 2 rows below.


**Model updates**:
- **Ring 2.6 1T Free**: removed
- **GLM 5 and GLM 5.1**: different settings based on subscription —
[131k](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode/models/glm-5.1.toml#L22)
[output](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode/models/glm-5.toml#L22)
on OpenCode but
[32k](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode-go/models/glm-5.1.toml#L22)
[output](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode-go/models/glm-5.toml#L22)
on OpenCode Go
- **MiniMax M2.5**: different settings based on subscription — [131k
output on
OpenCode](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode/models/minimax-m2.5.toml#L22)
and [65k on OpenCode
Go](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode-go/models/minimax-m2.5.toml#L19)
- **Nemotron 3 Super Free**: enabled interleaved reasoning as per
[docs](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode/models/nemotron-3-super-free.toml#L13).
Ran some quick tests and confirmed everything seems to work fine
(_"rename this variable. add a simple function. remove the function.
tell me a joke"_)
- **GPT 5.3 Codex Spark**: removed image support as per
[docs](https://github.com/anomalyco/models.dev/blob/dev/providers/opencode/models/gpt-5.3-codex-spark.toml#L23-L25)

The [docs say GLM 5 in OpenCode Zen has a deprecation date of May
14](https://opencode.ai/docs/zen/#deprecated-models) but that seems to
still be active and is [not marked as deprecated on
models.dev](https://github.com/anomalyco/models.dev/blob/8e710e19eabbfa464764afe54d67585cbee9f4d8/providers/opencode/models/glm-5.toml)
so I didn't remove it yet 🤷

----

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes https://github.com/zed-industries/zed/issues/56869

Release Notes:
- OpenCode: updated models (removed Ring 2.6 1T Free, enabled
interleaved reasoning for Nemotron 3 Super Free, deleted incorrect image
support for GPT 5.3 Codex Spark, and updated token counts for MiniMax
M2.5, GLM 5, and GLM 5.1)
- OpenCode Free: clearer docs for temporary free models

crates/opencode/src/opencode.rs

@@ -141,8 +141,6 @@ pub enum Model {
     MimoV2_5,
     #[serde(rename = "big-pickle")]
     BigPickle,
-    #[serde(rename = "ring-2.6-1t-free")]
-    Ring2_6_1TFree,
     #[serde(rename = "nemotron-3-super-free")]
     Nemotron3SuperFree,
     #[serde(rename = "qwen3.5-plus")]
@@ -204,10 +202,9 @@ impl Model {
             | Self::DeepSeekV4Flash => &[OpenCodeSubscription::Go],
 
             // Free models
-            Self::MiniMaxM2_5Free
-            | Self::Nemotron3SuperFree
-            | Self::BigPickle
-            | Self::Ring2_6_1TFree => &[OpenCodeSubscription::Free],
+            Self::MiniMaxM2_5Free | Self::Nemotron3SuperFree | Self::BigPickle => {
+                &[OpenCodeSubscription::Free]
+            }
 
             // Custom models get their subscription from settings, not from here
             Self::Custom { .. } => &[],
@@ -263,7 +260,6 @@ impl Model {
             Self::Qwen3_5Plus => "qwen3.5-plus",
             Self::Qwen3_6Plus => "qwen3.6-plus",
             Self::BigPickle => "big-pickle",
-            Self::Ring2_6_1TFree => "ring-2.6-1t-free",
             Self::Nemotron3SuperFree => "nemotron-3-super-free",
 
             Self::Custom { name, .. } => name,
@@ -316,7 +312,6 @@ impl Model {
             Self::Qwen3_5Plus => "Qwen3.5 Plus",
             Self::Qwen3_6Plus => "Qwen3.6 Plus",
             Self::BigPickle => "Big Pickle",
-            Self::Ring2_6_1TFree => "Ring 2.6 1T Free",
             Self::Nemotron3SuperFree => "Nemotron 3 Super Free",
 
             Self::Custom {
@@ -378,7 +373,6 @@ impl Model {
             | Self::DeepSeekV4Pro
             | Self::DeepSeekV4Flash
             | Self::BigPickle
-            | Self::Ring2_6_1TFree
             | Self::Nemotron3SuperFree => ApiProtocol::OpenAiChat,
 
             Self::Custom { protocol, .. } => *protocol,
@@ -395,8 +389,8 @@ impl Model {
             | Self::MimoV2_5Pro
             | Self::Glm5
             | Self::Glm5_1
-            | Self::BigPickle
-            | Self::Ring2_6_1TFree => true,
+            | Self::Nemotron3SuperFree
+            | Self::BigPickle => true,
 
             Self::Custom {
                 interleaved_reasoning,
@@ -407,7 +401,7 @@ impl Model {
         }
     }
 
-    pub fn max_token_count(&self) -> u64 {
+    pub fn max_token_count(&self, subscription: OpenCodeSubscription) -> u64 {
         match self {
             // Anthropic models
             Self::ClaudeOpus4_7 => 1_000_000,
@@ -436,13 +430,18 @@ impl Model {
             // OpenAI-compatible models
             Self::MiniMaxM2_7 => 204_800,
             Self::MiniMaxM2_5 | Self::MiniMaxM2_5Free => 204_800,
-            Self::Glm5 | Self::Glm5_1 => 202_725,
+            Self::Glm5 | Self::Glm5_1 => {
+                if subscription == OpenCodeSubscription::Go {
+                    202_752
+                } else {
+                    204_800
+                }
+            }
             Self::KimiK2_6 | Self::KimiK2_5 => 262_144,
             Self::MimoV2_5Pro => 1_048_576,
             Self::MimoV2_5 => 1_000_000,
             Self::Qwen3_5Plus | Self::Qwen3_6Plus => 262_144,
             Self::BigPickle => 200_000,
-            Self::Ring2_6_1TFree => 262_000,
             Self::Nemotron3SuperFree => 204_800,
             Self::DeepSeekV4Pro | Self::DeepSeekV4Flash => 1_000_000,
 
@@ -450,7 +449,7 @@ impl Model {
         }
     }
 
-    pub fn max_output_tokens(&self) -> Option<u64> {
+    pub fn max_output_tokens(&self, subscription: OpenCodeSubscription) -> Option<u64> {
         match self {
             // Anthropic models
             Self::ClaudeOpus4_7 | Self::ClaudeOpus4_6 => Some(128_000),
@@ -485,10 +484,22 @@ impl Model {
 
             // OpenAI-compatible models
             Self::MiniMaxM2_7 => Some(131_072),
-            Self::MiniMaxM2_5 | Self::MiniMaxM2_5Free => Some(131_072),
-            Self::Glm5 | Self::Glm5_1 => Some(32_768),
+            Self::MiniMaxM2_5Free => Some(131_072),
+            Self::MiniMaxM2_5 => {
+                if subscription == OpenCodeSubscription::Go {
+                    Some(65_536)
+                } else {
+                    Some(131_072)
+                }
+            }
+            Self::Glm5 | Self::Glm5_1 => {
+                if subscription == OpenCodeSubscription::Go {
+                    Some(32_768)
+                } else {
+                    Some(131_072)
+                }
+            }
             Self::BigPickle => Some(128_000),
-            Self::Ring2_6_1TFree => Some(66_000),
             Self::KimiK2_6 | Self::KimiK2_5 => Some(65_536),
             Self::Qwen3_5Plus | Self::Qwen3_6Plus => Some(65_536),
             Self::DeepSeekV4Pro | Self::DeepSeekV4Flash => Some(384_000),
@@ -525,7 +536,6 @@ impl Model {
             | Self::Gpt5_4Mini
             | Self::Gpt5_4Nano
             | Self::Gpt5_3Codex
-            | Self::Gpt5_3Spark
             | Self::Gpt5_2
             | Self::Gpt5_2Codex
             | Self::Gpt5_1
@@ -536,6 +546,9 @@ impl Model {
             | Self::Gpt5Codex
             | Self::Gpt5Nano => true,
 
+            // OpenAI models without image support
+            Self::Gpt5_3Spark => false,
+
             // Google models support images
             Self::Gemini3_1Pro | Self::Gemini3Flash => true,
 
@@ -556,7 +569,6 @@ impl Model {
             | Self::DeepSeekV4Pro
             | Self::DeepSeekV4Flash
             | Self::BigPickle
-            | Self::Ring2_6_1TFree
             | Self::Nemotron3SuperFree => false,
 
             Self::Custom { protocol, .. } => matches!(
@@ -571,7 +583,7 @@ impl Model {
 
     pub fn supported_reasoning_effort_levels(&self) -> Option<Vec<ReasoningEffort>> {
         match self {
-            Self::Ring2_6_1TFree | Self::MimoV2_5Pro | Self::MimoV2_5 => Some(vec![
+            Self::MimoV2_5Pro | Self::MimoV2_5 => Some(vec![
                 ReasoningEffort::Low,
                 ReasoningEffort::Medium,
                 ReasoningEffort::High,