AI Model Picker comparison
Claude Opus 5 vs GPT-5.6 Sol
Both products reached the final shortlist for the same buyer profile — Frontier Reasoning — in the AI Model Picker. Your answers favor maximum capability for hard reasoning, coding, and agentic work — cost is secondary to getting the task done.
Anthropic
Claude Opus 5
Anthropic frontier · See profile for verified API rates · 4.7 / 5
OpenAI
GPT-5.6 Sol
OpenAI frontier · $5 / $30 per million tokens (input / output) — verify on profile · 4.7 / 5
| What differs | Claude Opus 5 | GPT-5.6 Sol |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Positioning | Anthropic frontier | OpenAI frontier |
| Price positioning | See profile for verified API rates | $5 / $30 per million tokens (input / output) — verify on profile |
| Editorial rating | 4.7 / 5 | 4.7 / 5 |
| Best for | Long documents, careful analysis, and high-stakes drafting. | Complex reasoning and agentic workflows when cost is not the primary constraint. |
Features
What each one leads with
The standout capabilities recorded for each product in the recommendation data.
Claude Opus 5
- 1M context (verified on profile)
- Strong reasoning tier
- Text-focused modalities
GPT-5.6 Sol
- 1.05M context (verified on profile)
- Reasoning effort levels
- Image input modality
Trade-offs
Pros and cons, side by side
The strengths and the catches the decision tool already weighs for this buyer profile.
Claude Opus 5
Pros
- Natural alternative when OpenAI is not the default stack
- Head-to-head comparisons in the library
Cons
- Closed API — verify regional availability
- Frontier pricing like other flagships
GPT-5.6 Sol
Pros
- Flagship OpenAI tier in the catalog
- Profile links to comparisons vs Terra and Luna
Cons
- 25× Luna input price for routine volume work
- Closed weights — no self-hosting
The verdict
Who should pick which
Assembled from the same recommendation fields the tool scores on — not a universal winner.
Both products are finalists for the same buyer profile, so this is a fit decision rather than a category decision. Claude Opus 5 is aimed at long documents, careful analysis, and high-stakes drafting. GPT-5.6 Sol is aimed at complex reasoning and agentic workflows when cost is not the primary constraint. Both score 4.7 / 5 in this tool's editorial scoring, so the rating does not separate them — the "best for" lines above should.
Choose Claude Opus 5 if…
Long documents, careful analysis, and high-stakes drafting.
Watch out for
Closed API — verify regional availability
See profile for verified API rates
Choose GPT-5.6 Sol if…
Complex reasoning and agentic workflows when cost is not the primary constraint.
Watch out for
25× Luna input price for routine volume work
$5 / $30 per million tokens (input / output) — verify on profile
Common questions
Claude Opus 5 vs GPT-5.6 Sol
Answered from the verified figures on this page rather than general guidance.
Is Claude Opus 5 or GPT-5.6 Sol cheaper?
Claude Opus 5 is positioned as "See profile for verified API rates" and GPT-5.6 Sol as "$5 / $30 per million tokens (input / output) — verify on profile". These are positioning labels, not verified prices, so treat the difference as a prompt to check each vendor's current plans rather than a confirmed price gap.
Which is rated higher, Claude Opus 5 or GPT-5.6 Sol?
Neither — both score 4.7 / 5 in this tool's editorial scoring. The score measures fit for the buyer profile both were shortlisted under, so a tie means the use case should decide.
Should I choose Claude Opus 5 or GPT-5.6 Sol?
Choose Claude Opus 5 if your situation matches its "best for" line: long documents, careful analysis, and high-stakes drafting. Choose GPT-5.6 Sol if yours matches: complex reasoning and agentic workflows when cost is not the primary constraint. Both were shortlisted for the same buyer profile, so the closer match — not the badge or the rating — is the deciding signal.
What is the catch with Claude Opus 5 and GPT-5.6 Sol?
Claude Opus 5: Closed API — verify regional availability. Frontier pricing like other flagships. GPT-5.6 Sol: 25× Luna input price for routine volume work. Closed weights — no self-hosting.
A head-to-head answers one question: of the two finalists for this buyer profile, which fits your situation. If neither “best for” line matches, run the full tool — its other profiles exist for different buyers.