Is Claude Opus 5 or GPT-5.6 Sol better for coding?

It depends on the task. Claude Opus 5 (launched July 24, 2026) leads on repo-level, multi-file agentic coding and computer use — it outperforms GPT-5.6 Sol on six benchmarks including agentic coding. GPT-5.6 Sol leads on terminal/command-line coding, setting the Terminal-Bench 2.1 record (Sol Ultra 91.9%) and topping the Artificial Analysis Coding Agent Index at 80 with fewer output tokens per task.

How do Claude Opus 5 and GPT-5.6 Sol compare on price?

Claude Opus 5 costs $5 per million input tokens and $25 output. GPT-5.6 Sol costs $5 input and $30 output ($12.50/$75 for Sol Ultra). Opus 5 is slightly cheaper on output, but Sol uses fewer output tokens per task on agent benchmarks, so real cost-per-task is close — measure on your own workload.

Which should I default to in 2026?

Default to Claude Opus 5 for multi-file refactors, long-horizon autonomy, and computer use; default to GPT-5.6 Sol for terminal-heavy autonomous coding runs. Many teams route both behind a single interface (Claude Code, Codex, or a router) and pick per task rather than committing to one.

Quick Answer

Claude Opus 5 vs GPT-5.6 Sol: Coding & Agents

Published: July 27, 2026

The Short Answer

Claude Opus 5 wins repo-level and computer-use coding; GPT-5.6 Sol wins terminal coding and speed. Both launched into the July 2026 frontier tier at near-identical price ($5/$25 vs $5/$30). Pick by task shape, not by brand.

Head-to-Head (July 2026)

Dimension	Claude Opus 5	GPT-5.6 Sol
Launched	July 24, 2026	GA July 9, 2026 (preview June 26)
Price (in/out)	$5 / $25	$5 / $30 (Ultra $12.50/$75)
Context	1M tokens	Large context, long-run optimized
Repo-level / multi-file	Leads (SWE-bench Pro 79.2%)	Strong
Terminal / CLI	Strong	Leads (Terminal-Bench 2.1: Sol 88.8%, Ultra 91.9%)
Agent Index (Artificial Analysis)	Coding Index 78.0%	Coding Agent Index 80 (SOTA)
Computer use	Leads	Strong
Output-token efficiency	Good	Excellent (<half the tokens/time of Fable 5)

In direct benchmark comparisons, Opus 5 beats Sol on six benchmarks (including agentic coding and computer use), while Sol holds the terminal-coding record and tops the Coding Agent Index.

When to Pick Each

Choose Claude Opus 5 when:

You do multi-repo refactors, large multi-file features, or long-horizon debugging.
You need reliable self-correction over long tool-use sessions.
Computer use / browser-style agent tasks matter.
You want the same $5/$25 as Opus 4.8 with a step-change in reasoning.

Choose GPT-5.6 Sol when:

Your workload is terminal-first, autonomous command-line runs.
You want the fewest output tokens and fastest wall-clock per agent task.
You’re already in the Codex / OpenAI agent stack.

The Practical Play

Don’t marry one model. Run both behind Claude Code, OpenAI Codex, or a router (LiteLLM, OpenRouter) and route by task: Opus 5 for the plan and multi-file edits, Sol for the terminal execution loop. The frontier moves monthly — Grok 4.6 is imminent and Gemini 3.5 Pro is still in preview — so keep model choice a config value, not an architecture decision.

Sources

Anthropic — Claude Opus 5 (July 24, 2026): anthropic.com/news/claude-opus-5
OpenAI — GPT-5.6 Sol: openai.com/index/gpt-5-6
Artificial Analysis — GPT-5.6 has landed: artificialanalysis.ai/articles/gpt-5-6-has-landed
llm-stats — Opus 5 vs GPT-5.6 Sol: llm-stats.com/models/compare/claude-opus-5-vs-gpt-5.6-sol