Apex Models by Callstack

CallstackProprietaryCoding
Callstack releases · 1 in the last 12 monthsChangelog →
1 model2026Up to 262k ctxFrom $0.500/1M input

Last refreshed 2026-10-09. Next refresh: weekly.

Details

ResearcherCallstack
LicenseProprietary
Commercial useCommercial use: conditional
Models1
Released2026
Max context262k

Capabilities

ReasoningAll models
JSON / Tool useAll models

Links

Website

About

Apex is Callstack's family of specialised coding models for agentic software development. The first model, Apex (GA 1 October 2026), is a Qwen-based model post-trained by Callstack for React Native, React and Next.js work and served through Callstack's own API and Vercel AI Gateway.

Decision facts

Best fit
codingcodereasoning
Capability starting point
Apex with 262k context and reasoning and JSON / Tool use
Lowest tracked input
Apex · $0.500/1M · Callstack Apex API
Closest related family
SWE-1

Current Variants

Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.

1 in view
ApexCurrent

Use when the workload needs code, 262k context, and reasoning.

2026-10code262k contextreasoning

Release Timeline

1 release group
2026-10
1 current
Apex
code262k contextreasoning
Current

Specifications(1 models)

Apex model specifications comparison
ModelReleasedContextReasoningJSON / Tool use
Apex2026-10262kYesYes

Available From(2 providers)

Callstack Apex APIVercel AI Gateway

Pricing

Apex model pricing by provider
ModelProviderInput / 1MOutput / 1MType
ApexCallstack Apex API$0.5$3Serverless
ApexVercel AI Gateway$0.5$3Serverless