Claude Opus 4.8 vs GPT-5.6 Sol: which is better for agents?

GPT-5.6 Sol scores higher on output quality (8.6/10 vs 8.0/10), while GPT-5.6 Sol is the cheaper option. Claude Opus 4.8 is best for existing Opus 4.8 setups until they move to Opus 5.5; GPT-5.6 Sol is best for existing GPT-5.6 Sol setups until they move to GPT-6.1 Sol. Live community votes on this page show what people actually prefer.

Is Claude Opus 4.8 cheaper than GPT-5.6 Sol?

GPT-5.6 Sol is cheaper: roughly $4.40 vs $11 per 1M tokens (blended). Claude Opus 4.8: $5.00 in · $25 out / 1M tokens. GPT-5.6 Sol: $2.00 in · $10 out / 1M tokens.

Can I switch between Claude Opus 4.8 and GPT-5.6 Sol in the same agent?

Yes. Model-agnostic agents (Cline, Aider, OpenClaw, Hermes Agent, Kilo Code, OpenCode) let you swap models per task. Many people route hard tasks to the stronger model and routine work to the cheaper one.

Claude Opus 4.8 vs GPT-5.6 Sol: Which Is Better? (2026)

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality

Correctness and depth of what it produces

Agentic Ability

Tool calls, instruction-following, and multi-step tasks

Speed

Tokens per second and time-to-first-token

Value for Money

How much capability you get per dollar

Reliability

Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec

Opus 4.8

GPT-5.6 Sol

Maker

Anthropic

OpenAI

Blended price / 1M

$11

$4.40

Input / output

$5.00 in · $25 out / 1M tokens

$2.00 in · $10 out / 1M tokens

Context window

1.1M

Open weights

Tool use

Yes

Reasoning

Yes

Output Quality

8.0

8.6

Agentic Ability

6.7

7.9

Speed

6.7

7.6

Value for Money

4.3

4.6

Reliability

8.9

9.2

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Opus 4.8 or GPT-5.6 Sol?

Updated 2026-10-16

Choose Claude Opus 4.8 if you want existing Opus 4.8 setups until they move to Opus 5.5. Choose GPT-5.6 Sol if you want existing GPT-5.6 Sol setups until they move to GPT-6.1 Sol.

In our editorial scoring, GPT-5.6 Sol leads in 5 of five dimensions (output quality, agentic ability, speed, value for money and reliability), while Claude Opus 4.8 leads in 0. On price, Claude Opus 4.8 runs about $11 per 1M tokens (blended) and is proprietary; GPT-5.6 Sol is about $4.40 and proprietary.

Where Opus 4.8 falls short

Superseded by Claude Opus 5.5, which costs less ($4/$20 vs $5/$25) and scores far higher
Haiku 5.5 now scores higher on Artificial Analysis (43 vs 42) at a fraction of the price

Full Opus 4.8 breakdown →

Where GPT-5.6 Sol falls short