Torn between Claude Opus 4.5 and GPT-5.4 ? These two tools are among the most popular in leur catégorie, and the choice between them depends on your specific needs, your budget and your technical requirements. In this comparison, we analyse both solutions across 6 key criteria scored out of 10 for an objective and transparent comparison.
On the output quality criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (9.8/10 each). The difference will come down to other criteria depending on your use case.
On the price criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (8.0/10 each). The difference will come down to other criteria depending on your use case.
On the ease of use criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (9.8/10 each). The difference will come down to other criteria depending on your use case.
On the integrations criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (5.0/10 each). The difference will come down to other criteria depending on your use case.
On the french language support criterion, Claude Opus 4.5 takes the lead (9.0/10 vs 4.0/10 for GPT-5.4). A factor to consider if this criterion is a priority in your choice.
On the accessibility criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (8.0/10 each). The difference will come down to other criteria depending on your use case.
Claude Opus 4.5
Claude Opus 4.5 : modèle premium d’Anthropic pour code, agents et tâches complexes en entreprise.
GPT-5.4
Modèle frontière d'OpenAI combinant raisonnement, code et capacités agentiques avancées (1M tokens).
Claude Opus 4.5 prend l’avantage(+0.9 pts)
Claude Opus 4.5 slightly outperforms GPT-5.4 with an average score of 8.3/10 versus 7.4/10 in the IA category. GPT-5.4 remains a solid alternative depending on your priority criteria. Check the detailed scores above to identify each tool’s strengths.
In brief
Torn between Claude Opus 4.5 and GPT-5.4? Both tools are among the most popular in the Assistants category, and the choice between them depends on your specific needs, your budget and your technical requirements. In this comparison, we analyse both solutions across six key criteria scored out of 10 for an objective, transparent comparison.
Score by criterion
Average score
Summary table
| Criterion | Claude Opus 4.5 | GPT-5.4 | Winner |
|---|---|---|---|
| Output quality | 9.9/10 | 9.9/10 | Tie |
| Price | 7.5/10 | 7.0/10 | Claude Opus 4.5 |
| Ease of use | 9.5/10 | 9.5/10 | Tie |
| Integrations | 6.0/10 | 9.0/10 | GPT-5.4 |
| French language support | 9.0/10 | 9.0/10 | Tie |
| Accessibility | 7.5/10 | 7.5/10 | Tie |
| Average score | 8.2/10 | 8.7/10 | GPT-5.4 |
Detailed analysis
Output quality
On the output quality criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (9.9/10 each). The difference will come down to other criteria depending on your use case.
Price
On the price criterion, Claude Opus 4.5 comes out ahead (7.5/10 vs 7.0/10 for GPT-5.4). A factor to weigh if this criterion is a priority in your decision.
Ease of use
On the ease of use criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (9.5/10 each). The difference will come down to other criteria depending on your use case.
Integrations
On the integrations criterion, GPT-5.4 comes out ahead (9.0/10 vs 6.0/10 for Claude Opus 4.5). A factor to weigh if this criterion is a priority in your decision.
French language support
On the French language support criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (9.0/10 each). The difference will come down to other criteria depending on your use case.
Accessibility
On the accessibility criterion, Claude Opus 4.5 and GPT-5.4 are neck and neck (7.5/10 each). The difference will come down to other criteria depending on your use case.
Tool overview
Claude Opus 4.5
Claude Opus 4.5: Anthropic’s premium model for code, agents and complex enterprise tasks.
- Price
- From $20/month (Pro) + API $5/$25 per MTok
- Starting from
- USD 20/month
- Free trial
- Yes
- French
- Yes
- API
- No
Strengths
- Very strong at code
- Multi-step agents
- Hybrid reasoning
- Solid docs & spreadsheets
- Token-efficient
Weaknesses
- More expensive for simple use
- Quotas depending on plan
- Requires governance
- Sometimes overkill
GPT-5.4
OpenAI’s frontier model combining reasoning, code and advanced agentic capabilities (1M tokens).
- Price
- Free / From $20/month (ChatGPT Plus)
- Starting from
- USD 20/month
- Free trial
- Yes
- French
- No
- API
- Yes
Strengths
- 1M tokens
- Computer-use
- Code & agents
- Fewer errors
- Thinking/Pro/mini/nano
Weaknesses
- Pro is premium-priced
- API costs
- Thinking latency
- Usage policies
Who are these tools for ?
Choose Claude Opus 4.5 if…
- Developerson complex tasks and critical code
- SMBs & micro-businesseswho want a reliable everyday assistant
- Agencieswho produce deliverables and iterate quickly
- SaaS teamsintegrating a premium LLM via API
Choose GPT-5.4 if…
- Developers buildingcoding agents
- Advancedproductand data teams
- Startups integratingAI agents
- Professionals with high demands onreasoning
- Researchers andconsultantsdoing analysis
Our verdict
GPT-5.4 takes the lead (+0.5 pts)
GPT-5.4 comes out ahead of Claude Opus 4.5 (8.7/10 vs 8.2/10) in the Assistants category. That said, Claude Opus 4.5 remains relevant for certain specific use cases detailed above. Try both via their free trial to confirm which one best matches your needs.
Frequently asked questions
Is Claude Opus 4.5 better than GPT-5.4 in 2026 ?
Across our six criteria, Claude Opus 4.5 scores 8.2/10 against 8.7/10 for GPT-5.4. But the best choice depends on which criteria matter most to you — see the detailed analysis above.
Can Claude Opus 4.5 and GPT-5.4 be used together ?
Yes, some professionals combine both tools to take advantage of their respective strengths. Combined use may require manual transfers between the two interfaces.
What is the alternative to Claude Opus 4.5 and GPT-5.4 ?
The assistants market is rich in alternatives. Check our comparisons page to discover every tool in the category, or explore our full directory of more than 400 AI tools sorted by use case and rating.
Other AI assistant tool duels that might interest you.
Also worth reading
Claude Opus 4.5 est-il meilleur que GPT-5.4 en 2026 ?
According to our Battle, Claude Opus 4.5 achieves a better average score (8.3/10 versus 7.4/10). However, the best tool depends on your priorities: output quality, price, integrations, support. See the « Score by criterion » section to identify the one that matches your use case.
Peut-on utiliser Claude Opus 4.5 et GPT-5.4 ensemble ?
Oui, c’est même une stratégie courante : un outil principal pour le quotidien et l’autre en spécialiste sur des cas d’usage spécifiques. Tester gratuitement les deux est le moyen le plus fiable de trouver le bon mix pour votre workflow.
Quelle est l'alternative à Claude Opus 4.5 et GPT-5.4 ?
Several alternatives exist in cette catégorie. To explore the whole market, take a look at our full comparison and our other Battles in the same category.